18 • ADDICTION SCIENCE & CLINICAL PRACTICE—JULY 2011
Inhalant Use and Inhalant Use Disorders in the United States
M
ore than 22 million Americans age 12 and older have used inhalants, and every year more than 750,000 use inhalants for
the irst time. Despite the substantial prevalence and serious toxicities of inhalant use, it has been termed “the forgotten
epidemic.” Inhalant abuse remains the least-studied form of substance abuse, although research on its epidemiology, neurobiology, treatment, and prevention has accelerated in recent years. This review examines current indings in these areas, identiies gaps in the research and clinical literatures pertaining to inhalant use, and discusses future directions for inhalant-related
research and practice efforts.
Matthew O. Howard, Ph.D. 1
Scott E. Bowen, Ph.D. 2
Eric L. Garland, Ph.D. 3
Brian E. Perron, Ph.D. 4
Michael G. Vaughn, Ph.D. 5
1 University of North Carolina
Chapel Hill, North Carolina
2 Wayne State University
Detroit, Michigan
3 Florida State University
Tallahassee, Florida
4University of Michigan
Ann Arbor, Michigan
5 St. Louis University
St. Louis, Missouri
I
nhalant abuse refers to the intentional inhalation of vapors from commercial
products or specific chemical agents to achieve intoxication. Abusers may
inhale vapors directly from a container, from a bag into which a substance
has been placed, or from a rag soaked with a substance and then placed over the
mouth or nose (American Psychiatric Association [APA], 2000). Intoxication
occurs rapidly and is short-lived, although some abusers repeatedly or continuously
self-administer inhalants to maintain a preferred level of intoxication.
Inhalant abuse and dependence criteria parallel the generic substance abuse and
dependence diagnostic criteria outlined in the Diagnostic and Statistical Manual
of Mental Disorders, 4th Edition (DSM-IV; APA, 2000). The criteria do not
include withdrawal symptoms, although some evidence suggests a characteristic
withdrawal syndrome (Perron et al., 2009a). Amyl nitrate, other nitrite vasodilators,
and nitrous oxide are sometimes abused by inhalation, but the criteria specifically
exclude them from the list of substances considered.
Glue, shoe polish, toluene, spray paints, gasoline, and lighter fluid are among
the inhalants most commonly abused by young people (Substance Abuse and
Mental Health Services Administration [SAMHSA], 2008b). However, hundreds
of products containing single substances or mixtures that can produce intoxication
if inhaled are commercially available (Table 1). The huge variety of products that
emit psychoactive vapors poses difficulties for classification. The current approach
of grouping inhalants by form, product type, or intended use has conceptual and
heuristic limitations. Classification into groups that share pharmacological properties
and distinctive patterns of abuse may be more useful, but is unavailable at present
because little is known about the pharmacologic effects of many abused vapors.
RESEARCH REVIEWS—INHALANT USE AND INHALANT USE DISORDERS • 19
TABLE 1. Commonly Abused Inhalant Products and Their Constituents
GLUES AND ADHESIVES
Airplane glue
Toluene, ethyl acetate
Other glues and cements
Hexane, toluene, methyl chloride, acetone, methyl ethyl ketone, methyl butyl
ketone, benzene, xylene, trichloroethylene, tetrachloroethylene, chloroform
AEROSOLS
Spray paint
Butane, propane (U.S.), luorocarbons, toluene, hydrocarbons, xylene
Hair spray
Butane, propane (U.S.), chloroluorocarbons
Deodorant; air freshener
Butane, propane (U.S.), chloroluorocarbons
Analgesic spray
Chloroluorocarbons
Asthma spray
Chloroluorocarbons
Fabric spray
Butane, trichloroethane
PC cleaner
Dimethyl ether, hydroluorocarbons
Video head cleaner
Ethyl chloride
ANESTHETICS
Gaseous
Nitrous oxide
Liquid
Halothane, enlurane, deslurane, isolurane
Local
Ethyl chloride
CLEANING AGENTS
Dry cleaning
Tetrachloroethylene, trichloroethane
Inhalant use
Spot remover
Xylene, petroleum distillates, chlorohydrocarbons
disproportion-
Degreaser
Tetrachloroethylene, trichloroethane, trichloroethylene
ately afflicts
Lacquer; thinners
Acetone, methanol, ethyl acetate, methyl chloride, toluene
the poor, mentally ill, and
SOLVENTS AND GASES
juvenile- and
Nail polish remover
Acetone, ethyl acetate, toluene (rarely)
Paint remover
Toluene, methylene chloride, methanol, acetone, ethyl acetate
criminal-jus-
Paint thinner
Petroleum distillates, esters, acetone
tice involved.
Correction luid and thinner
Trichloroethylene, trichloroethane, isoparafins
Fuel gas
Butane, isopropane
Lighter luid
Butane, isopropane
Fire extinguisher
Bromochlorodiluoromethane
Gasoline
Benzene, n-hexane, toluene, xylene
Modiied from Sharp and Rosenberg (2005).
Although inhalant abuse is common and associated with
harmful outcomes that may rival or exceed those of other
psychoactive drugs (Dinwiddie, 1994; 1998; Sharp and
Rosenberg, 2005), inhalants remain the least-studied
class of psychoactive agents (Balster, 1996). There are
no clearly effective treatment interventions reported
in the clinical research literature. Here we discuss the
consequences of inhalant abuse and review potential
treatments under investigation and harm reduction
measures that appear to be effective.
EPIDEMIOLOGY OF INHALANT USE
The most informative surveys of inhalant use are the
Monitoring the Future (MTF) survey, the Youth Risk
20 • ADDICTION SCIENCE & CLINICAL PRACTICE—JULY 2011
Studies have
produced a
range of estimates of inhalant users’ risk
of developing
an inhalant use
disorder.
Behavior Survey (YRBS), and the National Survey on
Drug Use and Health (NSDUH) (Table 2). They reveal:
• An estimated 9 percent of the U.S. population age 12
and older—22.5 million people—has used an inhalant
for its psychoactive properties at least once (NSDUH);
• Inhalant use tends to start early, with 58 percent of
users reporting first use by the end of ninth grade
(MTF);
• Thirteen percent of students in grades 9 through 12
reported having ever used an inhalant on the 2007 YRBS;
• Fewer students in older grades than in younger grades
(15.7 percent in 9th grade, 9.9 percent in 12th grade)
reported having ever used an inhalant on the 2008
MTF, suggesting that many who start using inhalants
early drop out of school;
• Most inhalant users initiate the behavior quite young,
and most discontinue it quickly (Crocetti, 2008;
d’Abbs and MacLean, 2008; SAMHSA, 2008b;
Siqueira and Crandall, 2006). For example, the 2006
MTF indicated that on average, half of 8th, 10th, and
12th graders who had ever used inhalants had not
done so during the past year (Johnston et al., 2007).
However, as noted above, young people who drop out
of school appear to continue using inhalants at higher
rates than those who stay;
• White and Hispanic students reported lifetime use
rates (14.4 percent) that were about twice those of
African Americans (8.5 percent; YRBS);
• Important risk factors for inhalant use among middle
and high school students include low levels of parental
education and a lack of intention to complete 4 years
of college (MTF);
• More than half of eighth graders saw the regular use of
inhalants as a “great risk,” but only a third attributed
the same amount of danger to using an inhalant once
or twice (MTF).
The MTF and NSDUH have produced conflicting
findings regarding whether gender influences adolescent
inhalant use. The 2006 MTF indicated that more 8thand 10th-grade girls than boys, and more 12th-grade
boys than girls, had used an inhalant (Johnston et al.,
2007). In contrast, the NSDUH and its predecessor, the
National Household Survey on Drug Abuse (NHSDA),
have consistently shown equal use rates among boys and
girls (Neumark, Delva, and Anthony, 1998; SAMHSA,
2006; Wu, Pilowsky, and Schlenger, 2004).
Inhalant, use disproportionately afflicts subpopulations including the poor, mentally ill, and juvenile- and
criminal-justice involved (Howard et al., 1999). For
example, studies have documented inhalant use rates of:
• 34.3 percent among 475 juvenile probationers surveyed
in Utah (Howard and Jenson, 1999). The earlier that
individuals had initiated use and the more frequently
they used, the higher the likelihood that use was associated with significant psychosocial dysfunction;
• 36.9 percent of 723 Missouri youth surveyed in a
residential treatment center for antisocial behavior
(Howard et al., 2008);
• approximately 18 percent of 847 adolescents referred to
a treatment program for substance abuse or behavioral
problems (Sakai et al., 2004). In addition, 10 percent of
adult substance abusers surveyed in a treatment center
had used inhalants more than five times (Compton et
al., 1994).
Efforts have been made to identify subtypes of inhalant users, which could facilitate the identification of
at-risk individuals, assessment, and treatment planning
(Perron, Vaughn, and Howard, 2007; Vaughn, Perron,
and Howard, 2007). These studies have found elevated
inhalant use rates among youths who experienced a
recent major depressive episode (SAMHSA, 2008a) and
a subgroup of adolescents who used inhalants to “selfmedicate” for unhappiness and anxiety (Perron, Vaughn,
and Howard, 2007). These latter youths exhibited significantly more polydrug use, psychiatric comorbidity,
and antisocial behavior than did two other classes of
adolescent inhalant users.
Low monetary cost and ease of access probably
contribute to the concentration of inhalant use among
younger children and adolescents; low-income and
unemployed adults; people living in isolated rural or
reservation settings; and people housed in institutions
such as psychiatric hospitals, prisons, and residential
treatment centers. Inhalants can also be purchased and
used without arousing the suspicion of parents, salespeople, school or law enforcement professionals, social
service workers, or health care providers (Anderson and
Loomis, 2003). Few people, for example, think of butane
cigarette lighters, computer air dusters, nail polish, nail
polish remover, or paint thinner as items that can be
abused for their psychoactive effects; if challenged, young
people can often offer plausible benign explanations for
having these items.
EPIDEMIOLOGY OF INHALANT USE
DISORDERS
Inhalant use disorders are among the least prevalent
substance use disorders. In nationally representative
RESEARCH REVIEWS—INHALANT USE AND INHALANT USE DISORDERS • 21
TABLE 2. Nationally Representative Surveys of Inhalant Use
Survey
Name
Design, Target
Population, and
Frequency of
Administration
Inhalant Question
Estimates of Lifetime Prevalence
of Inhalant Use
Limitations and Strengths
of the Surveys
Monitoring
the Future
Annual cross-sectional
survey since 1975 for
12th-graders and since
1991 for 8th- and 10thgraders
“On how many occasions (if any) have
you sniffed glue, or breathed the contents of aerosol spray cans, or inhaled
any other gases or sprays in order to
get high in your lifetime?”
2010, by grade:
School-based survey
misses dropouts and
truants. Uses single
omnibus item for
inhalant use assessment.
“During the past 12 months?”
12th: 9.0%
8th: 14.5 %
10th: 12.0%
Provides data on
perceived danger and
disapproval of inhalants.
“During the past 30 days?”
Youth Risk
Behavior
Survey
National
Survey on Drug
Use
and Health
Semi-annual crosssectional survey conducted since 1991 for
grades 9 through 12
Annual crosssectional survey of
U.S. residents 12
and older conducted
since 1971
School-based survey
misses dropouts and
truants.
Middle school version: “Have you ever
sniffed glue, or breathed the contents
of spray cans, or inhaled any paints or
sprays to get high?” Response options:
Yes/No.
2009, by grade:
High school version: “During your life,
how many times have you sniffed glue,
breathed the contents of aerosol spray
cans, or inhaled any paints or sprays
to get high?” Response options: 0
times; 1 or 2 times; 3 to 9 times; 10 to
19 times; 20 to 30 times; 40 or more
times.
12th: 9.1%
Provides data on comorbid risk behavior and
state-speciic indings.
“These next questions are about liquids, sprays, and gases that people
sniff or inhale to get high or to make
them feel good. Have you ever, even
once, inhaled [INHALANT NAME] for
kicks or to get high? Response options:
Yes/No for the following inhalants: a)
amyl nitrite “poppers,” locker room
odorizers or “rush;” b) correction luid,
degreaser, or cleaning luid; c) gasoline or lighter luid; d) glue, shoe polish, or toluene; e) halothane, ether, or
other anesthetics; f) lacquer thinner or
other paint solvents; g) lighter gases,
such as butane or propane; h) nitrous
oxide or “whippets; ” i) spray paints; j)
some other aerosol spray; and k) any
other inhalants besides the ones that
have been listed.
2007 by grade:
Household survey that
captures dropouts and
truants, but misses institutionalized populations
and respondents younger
than 12.
9–12: 11.7%
10th: 12.5%
8th: 12.0%
10th: 10.7%
12th: 8.2%
9–12: 10.8%
12 years or
older: 9.1% or
22,470,000 U.S.
residents.
Provides state-speciic
estimates.
22 • ADDICTION SCIENCE & CLINICAL PRACTICE—JULY 2011
Motor deficits
observed in
mice exposed
to toluene
imply longlasting brain
damage.
surveys, youths reporting symptoms that would permit a
diagnosis of inhalant abuse or dependence have included
0.6 percent of the 15- to 24-year-old participants in the
1992 National Comorbidity Survey (NCS) (Anthony,
Warner, and Kessler, 1994), and 0.2 percent of the 12- to
17-year-olds who responded to the 2002–2003 NHSDA
(Wu, Pilowsky, and Schlenger, 2004). The past-year
prevalence of inhalant use disorder among adult participants in the 2001–2002 National Epidemiologic
Survey on Alcohol and Related Conditions was 0.02
percent (Grant et al., 2004).
Studies have produced a range of estimates of inhalant
users’ risk of developing an inhalant use disorder. At the
lower end, an analysis of NCS data yielded an estimate
that 7.9 percent of 15- to 24-year-olds with a history of
inhalant use were dependent (Anthony, Warner, and
Kessler, 1994). Similarly, Wu, Pilowsky, and Schlenger
(2004) found that 6 percent of 12- to 17-year-olds who
reported past-year use on the 2000 and 2001 NHSDA
surveys met criteria for past-year inhalant abuse, and 4
percent met criteria for past-year dependence. Higher
estimates for rates of inhalant use disorders among individuals with histories of inhalant use include:
• 18 percent among adults who participated in the nationally representative National Epidemiologic Survey on
Alcohol and Related Conditions (Wu and Howard,
2007b);
• 47 percent among a community sample of 162 young
adults in St. Louis, Missouri (Ridenour, Bray, and
Cottler, 2007).
The wide divergence in prevalence estimates may
reflect the presence of elevated-risk groups in some samples. For example, Howard and Perron (2009) found a
47 percent prevalence of inhalant use disorders among
279 juvenile justice-involved inhalant users in Missouri.
In the Wu, Pilowsky, and Schlenger NHSDA-based
study (2004), adolescents who had initiated inhalant
use before age 15 were five to six times as likely as those
who had started later to be diagnosed with inhalant
dependence in the year prior to the survey.
CONSEQUENCES OF INHALANT USE
Inhalant use is associated with a large number of adverse
effects and psychosocial outcomes.
Acute Effects
Inhalant intoxication produces a syndrome similar to
alcohol intoxication, consisting of dizziness, incoordination, slurred speech, euphoria, lethargy, slowed
reflexes, slowed thinking and movement, tremor, blurred
vision, stupor or coma, generalized muscle weakness,
and involuntary eye movement (APA, 2000). Inhalant
use can result in chemical and thermal burns ( Moreno
and Beierle, 2007), withdrawal symptoms (Keriotis and
Upadhyaya, 2000), persistent mental illness (Jung, Lee,
and Cho, 2004), and catastrophic medical emergencies
such as ventricular arrhythmias leading to “sudden sniffing death” ( Avella, Wilson, and Lehrer, 2006; Bowen,
Daniel, and Balster, 1999). Inhalant intoxication also
increases the risk for fatal injuries from motor vehicle
or other accidents (Bowen, Daniel, and Balster, 1999).
Neurological and Cognitive Effects
Studies of occupationally exposed workers laid the
foundation for much of what we know about inhalantrelated cognitive deficits. Morrow and colleagues (1997)
found significant learning and memory impairments in
journeyman painters relative to controls and evidence
that many patients’ inhalant-related cognitive problems
were slow to resolve (Morrow, Steinhauer, and Condray,
1996; 1998).
Even a single occupational exposure leading to
inhalant intoxication can produce long-term memory
problems and processing speed impairments (Stollery,
1996), an ominous finding given that inhalant abuse
is characterized by exposures to neurotoxins at much
higher levels than those typically incurred in occupational
exposures (Bowen, Wiley, and Balster, 1996).
Early research with recreational inhalant users noted
that, similar to the findings with occupational exposures,
these individuals have memory, attention, and judgment deficits compared with controls and polydrug
users (Hormes, Filley, and Rosenberg, 1986; Korman,
Trimboli, and Semler, 1980). Maruff and colleagues
(1998) found that current inhalant users performed worse
than former users and controls in a test of visual-spatial
memory that challenges the test taker to remember the
location in which a symbol briefly flashed on a computer
screen. Tenebein and Pillay (1993) found diminished
brain activity in response to visual and auditory events, a
possible marker for neurological dysfunction, in 8 of 15
inhalant users 9 to 17 years of age, even though the youths
had no clinical evidence of neurological abnormalities.
Subsequent studies have disclosed that recurrent
inhalant intoxication can lead to neurological disorders,
including Parkinsonism, impaired cognition due to degradation of brain cells (encephalopathy) or loss of brain
cells (cerebral atrophy), and loss of muscle strength and
RESEARCH REVIEWS—INHALANT USE AND INHALANT USE DISORDERS • 23
coordination due to damage to the cerebel- FIGURE 1. Brain Atrophy in a Toulene Abuser
lum (cerebellar ataxia) (e.g., Finch and Lobo,
A.
B.
2005; Gautschi, Cadosch, and Zellweger,
2007). Imaging studies of inhalant abusers
have documented thinning of the corpus
callosum (the band of nerve fibers joining
the cerebral hemispheres) and lesions of the
white matter that facilitates communication
between brain cells (Finch and Lobo, 2005;
Gautschi, Cadosch, and Zellweger, 2007).
Regional reductions in cerebral blood flow
are observable with functional magnetic
resonance imaging (fMRI) after 1 year of
inhalant use (Okada et al., 1999; YamanouCompared with the brain of an individual with no history of inhalant abuse (A), that of a chronic toluene
chi et al., 1998). Other radiologic abnormali- abuser (B) is smaller and ills less of the space inside the skull (the white outer circle in each image).
ties found in inhalant users include areas of Courtesy of Neil Rosenberg, M.D., NIDA Research Report (NIH 05-3818).
reduced MRI signal strength (hypointensities) in the thalamus and basal ganglia (Lubman, Yücel, and Lawrence, 2008) and irregular uptake of
(TCE) impair learning, memory, and attention (e.g.,
radiolabeled pharmaceuticals in single-photon emission
von Euler et al., 2000).
computed tomography (SPECT) studies (Küçük et al.,
Effects on Organs Other Than the Brain
2000). Lubman and colleagues (2008) reviewed recent
Evidence is mounting that inhalants can cause chronic
clinical and neuroimaging studies of chronic inhalant
medical problems affecting multiple organ systems
abusers, documenting significant cognitive deficits,
(Figure 2). Animal studies, case reports, and small
structural abnormalities in specific brain areas (e.g.,
clinical investigations have implicated inhalant use in
periventricular, subcortical, and white matter), and
liver, heart, and kidney toxicity; bone demineralizareduced brain perfusion and blood flow.
tion; bone marrow suppression; and reduced immunity Adult inhalant
Animal models have been helpful for studying acute
(T-cell responsivity) (e.g., Karmakar and Roxburgh, abusers have
and chronic biobehavioral effects of inhalants. They
2008; Takaki et al., 2008). Diminished plasma and red
have shown that toluene and other inhalants can have
higher rates of
blood cell levels of selenium and zinc have also been
reversible disruptive effects on response rates in behavior
noted, potentially impairing immune function and major depresmodification protocols; most of these effects appear to
increasing the risk for infectious disease (Zaidi et al., sion, suicidal
be greater after binge patterns of exposure than after
2007). O’Brien, Yeoman, and Hobby (1971) reported ideation and
lower levels of exposure (see Bowen et al., 2006, for
a case of liver and kidney failure in a 19-year-old who attempts, and
review). In one of the few animal studies to examine the
had sniffed glue for 3 years, and Wiseman and Banim
impact of binge-pattern exposures on higher cognitive
anxiety and
(1987) diagnosed irreversible congestive heart failure in
processes, Bowen and McDonald (2009) reported that
a 15-year-old patient who had sniffed glue for 2 years. substance use
mice exposed to high concentrations of toluene (3,600
Inhalants can also cause peripheral neuropathy lead- disorders.
and 6,000 parts per million) for 30 minutes per day for
ing to chronic pain and vision-impairing optic nerve
40 days (similar to the amounts chronic abusers inhale)
damage (e.g., Twardowschy et al., 2008).
demonstrated long-lasting motor deficits on a waitingSeveral recent studies suggest that inhalant abuse
for-reward task. This result implies the presence of longis associated with serious pulmonary dysfunction and
term brain damage, possibly resulting from cerebellar
disease. An epidemiological study of 29,195 adults aged
insult or cortical cell loss. Further animal trials are needed
35 to 49 participating in the NSDUH found that durato identify toluene’s impact on cognition so that these
tion of inhalant abuse was significantly positively associtoluene-related impairments can be recognized early
ated with likelihood of having experienced tuberculosis,
and measures can be initiated to prevent potentially
bronchitis, asthma, and sinusitis (Han, Gfroerer, and
extensive neurological damage. Additional preclinical
Colliver, 2010). Cayir and colleagues (2011) compared
studies suggest that toluene and 1,1,1-trichloroethane
24 • ADDICTION SCIENCE & CLINICAL PRACTICE—JULY 2011
Jackie Heda, CMI
FIGURE 2. Organs Damaged by Inhalant Exposure
Brain
Optic Nerve
Peripheral
Nerves
Lung
Heart
Kidney
Liver
Bone and
Marrow
18 volatile solvent abusers with 18 control subjects (all of
whom were tobacco smokers), noting that radioisotope
pulmonary clearance was significantly accelerated in
the solvent abuser group. The authors concluded that
alveolo-capillary membrane dysfunction may follow
inhalant abuse. A recent death of an 18-year-old man
due to bilateral pneumonia following inhalation of a
computer keyboard cleaner has also raised concerns
about potential pulmonary consequences of inhalant
abuse (Schloneger, Stull, and Singer, 2009).
Psychosocial Effects
Workers occupationally exposed to inhalants experience
relatively high post-exposure levels of depression and
anxiety (Morrow et al., 2000). Condray and colleagues
(2000) found that journeyman painters were significantly
more likely than controls (41 percent versus 16 percent)
to meet lifetime criteria for a mood disorder and that
virtually all painters who met criteria for a mood dis-
order experienced their first episode after starting their
painting careers.
Relatively little is known about the natural history
of inhalant use, inhalant use disorders, and associated
psychiatric and psychosocial comorbidities in the general
population. Clinical, criminological, and general population studies have identified robust associations between
lifetime inhalant use, other drug use, and mental health
disorders or symptoms. For example, SAMHSA (2005)
estimated that youths who had used inhalants by ages
12 or 13 were nearly five times as likely than nonusing
peers to have used another psychoactive drug. Associations between early-onset inhalant use and risk for later
heroin and intravenous drug use (Storr, Westergaard,
and Anthony, 2005; Wu and Howard, 2007a), antisocial
behavior, and polydrug abuse have also been identified
(SAMHSA, 2005).
Studies of adults in substance abuse treatment and
in the general population indicate that inhalant users
have higher rates of major depression, suicidal ideation
and attempts, anxiety disorders, and other substance
use disorders than nonusers of inhalants (Howard et
al., 2010a; 2010b). Wu and Howard (2007b) and Wu,
Howard, and Pilowsky (2008) documented dramatically
elevated rates of mood and anxiety disorders, personality
disorders, and substance use disorders in a nationally
representative sample of U.S. inhalant users. Inhalant
use and inhalant use disorders also appear to raise the
odds for stressful life events such as having troubles at
school or with a boss or co-worker, being fired, or being
arrested or sent to jail (Dinwiddie, 1994; 1998).
Some researchers have questioned whether inhalant use contributes directly to subsequent drug use and
adverse psychosocial outcomes, arguing instead that
it may be a general indicator of a deviant disposition
(Howard and Jenson, 1999; 2010a; 2010b). Published
reports suggest that childhood and adolescent inhalant
use may be a “red flag” signaling membership in a subgroup of antisocial youths that is marked by high levels
of psychiatric symptoms, polydrug use, and psychosocial
impairment, as well as earlier onset of behavior problems
and a wider range of antisocial conduct than are typical
of nonusers of inhalants (Howard and Jenson, 1999;
Howard et al., 1999; 2008; Freedenthal et al., 2007;
Jacobs and Ghodse, 1988; McGarvey, Canterbury, and
Waite, 1996). Additional studies are needed to evaluate how inhalant abuse contributes to the etiology of
psychiatric disorders and related mental, emotional,
and physical disabilities.
RESEARCH REVIEWS—INHALANT USE AND INHALANT USE DISORDERS • 25
Effects on the Fetus
Maternal inhalant use during pregnancy may produce
effects in offspring similar to those seen in fetal alcohol
syndrome (Jones and Balster, 1998; Bowen and Hannigan, 2006; Hannigan and Bowen, 2010). One study, for
example, reported high rates of head and facial deformities, smaller-than-normal head and brain development,
low birth weight, developmental delays, and other pregnancy and birth complications in infants born to women
who inhaled solvents recreationally (Pearson et al., 1994).
Tenebein (1993) described a neonatal withdrawal syndrome potentially attributable to maternal inhalant
use. Recent laboratory studies also have demonstrated
evidence of growth and developmental aberrations,
physical deformities, and other adverse outcomes (e.g.,
Bowen et al., 2005; 2007; 2009; Bowen, Hannigan,
and Cooper, 2009).While discussion of these findings is
beyond the scope of this paper, they have been capably
reviewed by Bowen and colleagues (2006), Lubman and
colleagues (2008), and Hannigan and Bowen (2010).
FUTURE RESEARCH
NEUROBIOLOGY OF INHALANT USE
• Evaluations of promising inhalant use prevention interventions; and
Much has been learned during the past decade about
inhalants’ pharmacological properties and effects (Bowen
et al., 2006; Lubman, Yücel, and Lawrence, 2008).
Although there has been limited research on the reinforcing properties of inhalants, animal studies suggest
that several abused inhalants function as reinforcers (see
Bowen et al., 2006, p. 643, for a review of findings).
For example, in the conditioned place preference reward
paradigm, toluene increases rats’ tendency to gravitate to a chamber in which they formerly received the
drug over one in which they did not (Lee, Schiffer, and
Dewey, 2004). Of the few studies that have examined
self-administration of inhaled compounds in nonhuman
species, one demonstrated that mice will self-administer
intravenous toluene and TCE (Blokhina et al., 2004),
and another has shown that rats will self-administer ether
vapor (Pogorelov
Pogorelov and Kovalev, 1999).
). Other investigations have demonstrated that nonhuman primates will
self-administer chloroform, ether, nitrous oxide, and
toluene (see Evans and Balster, 1991).
Toluene and TCE appear to produce motor excitation at low concentrations and sedation, anesthesia,
coma, and death at higher concentrations (Bowen and
Balster, 1998). Benzene and diethyl ether also produce
tranquilizing effects (Bowen, Wiley, and Balster, 1996;
Paéz-Martinez, Cruz, and López-Rubalcava, 2003).
Bowen and colleagues (2006) concluded that “the anx-
• Evaluations of product modiication, law enforcement, and other supplyside approaches to reducing the availability of abused inhalants in the
social and physical environments.
Inhalant abuse is one of few types of substance abuse for which demonstrably effective treatment interventions are largely absent from the clinical
research literature. Speciic areas for future research include:
• Ethnographic studies of cross-national patterns of inhalant use, including products (agents) used and consequences of use;
• Longitudinal studies of the trajectory of inhalant use and inhalant use
disorders, including factors that predict initiation, escalation, maintenance, and cessation of use (e.g., Perron et al., 2009b);
• Investigations of the clinical manifestations of inhalant use disorders,
including the nature and characteristics of tolerance and withdrawal
symptoms across a wide range of abused inhalants;
• Studies of acute and long-term consequences of inhalant use;
• Psychometric evaluations of the reliability, validity, and latent structure
of DSM-IV inhalant abuse and dependence diagnoses (e.g., Howard et
al., 2001; Howard and Perron, 2009);
• Eficacy trials of combined pharmacological and psychosocial interventions for adolescents and adults with inhalant use disorders;
• Taxonomic efforts to identify subtypes of inhalant users and abusers;
iolytic [anxiety reducing] effects of solvents are not an
unexpected finding since these compounds, like other
[central nervous system] depressants, act as positive
modulators of GABAA receptors… [W]hat remains
unclear is whether other solvents share these anxiolytic
properties, the relative potencies to produce these effects,
and whether tolerance (or sensitization) develops after
chronic binge exposure.”
The neuropharmacological effects of these solvents
do not appear to be limited to modulation of the GABA
receptor. Drug-discrimination studies using laboratory
animals (Bowen et al., 1999) have shown that toluene
can induce subjective effects similar to those of the psychedelic anesthetic phencyclidine (PCP), suggesting
that toluene, like PCP, may block the NMDA receptor. It should be noted, however, that toluene failed to
induce subjective effects similar to those of dizocilpine,
another selective NMDA receptor blocker, in a similar
drug-discrimination study (Shelton and Balster, 2004).
In support of these behavioral results, recent in vitro
studies have demonstrated that several abused inhal-
Toluene
can induce
subjective
effects similar
to those of
phencyclidine
(PCP).
26 • ADDICTION SCIENCE & CLINICAL PRACTICE—JULY 2011
An instrument
for assessing
abuse of 55
products is
available without cost.
ants act with varying affinity and efficacy at a number
of molecular sites. Toluene appears to cause its central nervous system depressant effects in large part by
noncompetitively preventing glutamate stimulation
of NMDA NR1 and NR2B receptor subtypes (Bale et
al., 2005; Cruz et al., 1998), and prolonged exposure
to toluene increases levels of brain NMDA receptors
(Williams, Stafford, and Steketee, 2005). Other solvents,
including benzene, ethylbenzene, propylbenzene, TCE,
and xylene, also antagonize the NMDA receptor (Cruz,
Balster, and Woodward, 2000; Raines et al., 2004).
A recent study showed that toluene and alcohol
exert opposite effects on two channels that mediate the
passage of potassium into and out of brain cells (the
large-conductance calcium-activated potassium channel
and G protein–coupled inwardly rectifying potassium
channel). Alcohol excites these channels, but toluene
inhibits them, a finding that eliminates them as likely
candidates to underlie effects that toluene and alcohol
produce in common (Del Re, Dopico, and Woodward,
2006). Exposure to toluene increases dopamine levels
in the rat prefrontal cortex and striatum and increases
neuronal firing in the ventral tegmental area in a manner similar to other drugs of abuse, effects that could
be integral to the rewarding effects of toluene (Riegel
and French, 1999; 2002; Riegel et al., 2004; 2007).
Gerasimov and colleagues (2002; 2005) demonstrated
that radioactively labeled toluene, butane, and acetone
were rapidly taken up and cleared from areas such as the
striatal and frontal brain regions of nonhuman primates.
SCREENING AND ASSESSMENT
Systematic screening and assessment of inhalant use
would facilitate earlier and more effective prevention and
treatment, but clinicians appear to have a low index of
suspicion for inhalant use and related problems (Anderson and Loomis, 2003). A few attempts have been made
internationally to develop paper-and-pencil screening
assessments of inhalant use, but these instruments are
of limited utility for U.S. practitioners (e.g., Ogel et
al., 2005). Howard and colleagues (2008) prepared
the Volatile Solvent Screening Inventory (VSSI) and
Comprehensive Solvent Assessment Interview (CSAI).
The VSSI is freely available, requires approximately 20
minutes to complete, and assesses past-year and lifetime
frequency of use of 55 inhalant chemicals and products,
medical history, demographic characteristics, current
psychiatric symptoms, suicidal thoughts and attempts,
trauma history, temperamental traits such as impulsivity,
and the frequency and nature of antisocial behavior in
the prior year. The CSAI is also free, requires 20 to 90
minutes to complete (depending on the extent of the
reported history of inhalant use), and assesses reasons
for starting and stopping inhalant use; typical modes,
locations, contexts and subjective effects of use; adverse
acute consequences of inhalant intoxication; perceived
risks of inhalant use; estimated likelihood of future use;
sibling and friends’ inhalant use; and DSM-IV inhalant
abuse and dependence criteria. The reader can access
these instruments on the Internet: dx.doi.org/10.1016/j.
drugalcdep.2007.08.023 (Howard et al., 2008).
Efforts are under way to improve laboratory diagnosis
of inhalant use and abuse (e.g., Chakroun et al., 2008;
Thiesen, Noto, and Barros, 2007), but such tests are not
yet widely available, nor have they been implemented in
routine clinical practice. Findings from the occupational
toxicology and inhalant abuse literature suggest that
bioassays for hippuric acid, o-cresol levels, and benzylmercapturic acid may eventually be useful urinary
markers of toluene abuse (Broussard, 2000; Chakroun
et al., 2008; Çök, Dagdelen, and Gökçe, 2003; Inoue
et al., 2004; Ukai et al., 2007).
TREATMENT AND PREVENTION
Few studies have examined pharmacological or psychosocial interventions for those who use inhalants or who
have inhalant-induced disorders. Reasons for the lack
of studies are unclear. Drug abuse researchers may have
been slow to recognize the importance of inhalant use
disorders, perhaps because of the stigmatized nature of the
behavior. Studies may be difficult to execute because of
the social disenfranchisement of inhalant users and their
frequent residence in locations that are geographically
isolated (e.g., rural settings or reservations) or inhospitable to clinical research (e.g., juvenile or criminal justice
facilities or psychiatric hospitals). In addition, people who
have inhalant use disorders may be difficult to recruit,
assess, and follow because they are typically dependent
on multiple drugs and afflicted with comorbid mood,
anxiety, and personality disorders.
Treatment programs that specialize in inhalant
dependence are almost nonexistent in the United States;
only one, the Tundra Swan Inhalant Treatment Program
of the McCann Treatment Center in Bethel, Alaska, is
currently operating. This center is administered by the
Yukon-Kuskokwim Health Corporation and serves
15 to 19 youths at a time, who range in age from 10
to 18 years and reside mostly in nearby rural Alaskan
RESEARCH REVIEWS—INHALANT USE AND INHALANT USE DISORDERS • 27
areas. Treatment services include traditional indigenous
cultural practices, such as native dancing, crafts, and
sweat lodges, and intensive family involvement. No
formal evaluations of the Tundra Swan program have
been published.
Nevertheless, substance abuse treatment practitioners
express a desire for specialized training in inhalant-related
assessment and treatment. Beauvais and colleagues (2002)
surveyed 550 program directors in the United States:
nearly three-quarters (73.9 percent) responded that
inhalant abusers were somewhat-to-substantially more
difficult to treat compared with abusers of other drugs,
and only 15.1 percent thought current training resources
were sufficient. A large survey of agencies serving young
people in Wisconsin reported similar findings: 40.6
percent of respondents indicated that inhalant abusers
exhibit brain impairments and medical, family, and
developmental concerns that are more severe than those
of other drug abusers (Malesevich and Jadin, 1995).
Survey respondents tended to believe that detoxification
and treatment stays should be longer for inhalant abusers than for abusers of other psychoactive drugs. Given
the substantial prevalence and serious consequences
of inhalant abuse and the virtual absence of specialty
inhalant treatment programs in the United States, it is
important that practitioners become aware of current
inhalant screening and treatment approaches.
Pharmacological Interventions
Pharmacologic treatments for inhalant use disorders have
rarely been evaluated. A few studies have documented
reductions in psychotic symptoms in inhalant abusers,
although it is not clear whether the psychoses were due
to or simply comorbid with the inhalant abuse:
• Misra, Kofoed, and Fuller (1999) reported successful
use of risperidone to treat paranoid psychosis in a
25-year-old Caucasian man who had been inhaling
gasoline and carburetor cleaner almost daily for 5
years and who had failed to fully respond to prior
trials with thioridazine and divalproex. Risperidone
given at a dosage of 0.5 mg twice daily for 4 weeks
reduced auditory and visual hallucinations, paranoia,
and aggressive behavior. When the dose of risperidone
was increased to 1 mg twice daily, craving for inhalants
was significantly reduced, paranoid ideation ceased,
and continuous abstinence from inhalants was maintained for 12 weeks. The researchers recommended
that risperidone be studied further as a treatment for
craving in inhalant-dependent people.
• Hernandez-Avila and colleagues (1998) conducted a
randomized trial with 40 psychotic men with histories
of inhalant abuse who were treated with either haloperidol or carbamazepine. After 5 weeks of treatment,
the men in both the carbamazepine and haloperidol
groups showed reductions in symptom severity of 48.3
percent and 52.7 percent, respectively, on the Brief
Psychiatric Rating Scale. The investigators concluded
that approximately half of the patients in each arm of
the study responded to treatment, but that carbamazepine caused fewer side effects.
One case report and one preclinical study have
reported positive but very preliminary evidence of
potentially effective pharmacotherapies for inhalant
dependence. Shen (2007) described the successful treatment of a 21-year-old man who had been using inhalants
for 4 years but had no history of other substance abuse
problems. When treated with 100 mg of lamotrigine
daily, the subject reported fewer cravings for inhalants
and achieved 6 months of continuous abstinence without
significant side effects from the medication. Lee, Schiffer,
and Dewey (2004) reported preclinical evidence suggesting that vigabatrin, a selective GABA transaminase
inhibitor, could be an effective treatment for inhalant
dependence.
Lamotrigine
and vigabatrin
have shown
potential effec-
Psychosocial Interventions
tiveness for
Few psychosocial interventions have been tested with
inhalant users in the United States. Holistic approaches
incorporating elements of traditional indigenous cultures
have reportedly been used successfully in Canada (Dell,
Dell, and Hopkins, 2005; YSAC Annual Report, 2007)
and with aboriginal populations in Australia (Preuss
and Brown, 2006). Demand-reduction interventions—
including community-based approaches, education,
youth and recreation programs, clinical management
and counseling, and residential programs—were comprehensively evaluated in a recent Australian report (d’Abbs
and MacLean, 2008). The relevance of these findings to
an American context is uncertain. The recommendation that treatment be broadly focused on the diverse
problems of inhalant users is certainly sensible, as are the
notions that aftercare and family involvement are crucial.
D’Abbs and MacLean (2008) addressed the highly
controversial topic of harm reduction interventions.
These interventions have, for example, encouraged
inhalant users to avoid covering their heads with plastic bags to prevent accidental asphyxiation; sniff from
containers with small surface areas; avoid inhalation in
treating inhalant dependence.
28 • ADDICTION SCIENCE & CLINICAL PRACTICE—JULY 2011
Several promising prevention strategies
have been
identified in
recent years.
enclosed places or in hazardous places such as next to busy
roadways; inhale under supervision; take precautions to
avoid burns, overdose, and aspiration of vomitus; and
avoid inhalants such as butane and propane that pose
heightened risk for sudden death. Ethnographic studies
indicate that some inhalant users take the initiative to
minimize risks associated with their inhalant use (Sandover, Houghton, and O’Donoghue, 1997).
Broadly focused biopsychosocial treatment interventions may well be critically important given the manifold
problems of inhalant abusers. Outreach to homeless
young people and adults, youths who have dropped
out of school or who are frequently truant, people in
juvenile or adult correctional facilities or psychiatric
hospitals, and inhalant abusers who are not actively
seeking treatment is critical.
Additional treatment research is also critical, because
current findings suggest that inhalant abusers may have
comparatively poor treatment outcomes (e.g., Sakai,
Mikulich-Gilbertson, and Crowley, 2006).
Prevention
Prevention approaches targeted to inhalant use are
uncommon and have not always been successful (e.g.,
Brown et al., 2007; Collins, Johnson, and Becker, 2007;
Furr-Holden et al., 2004). However, several promising prevention strategies have been identified in recent
years. Schinke and colleagues evaluated correlates of
inhalant use among adolescent girls and subsequently
reported significantly reduced inhalant use at a 2-year
followup in a randomized controlled trial of a genderspecific, computer-delivered prevention intervention
for adolescent girls and their mothers (Schinke, Fang,
and Cole, 2008; 2009).
An innovative, integrated approach to inhalant use
prevention involving community mobilization efforts,
environmental strategies, and school-based activities
was described by Johnson and colleagues at the Pacific
Institute for Research and Evaluation. They describe
results of a related feasibility evaluation (Johnson et al.,
2007), explain how the environmental component—
designed to reduce retailers’ sales of inhalants—can be
implemented and evaluated (Courser et al., 2007), and
present positive findings from a randomized controlled
evaluation of the intervention, which was implemented
in frontier Alaskan communities (Johnson et al., 2009).
These reports and others that present positive findings
regarding inhalant prevention (e.g., Spoth et al., 2007)
suggest that comprehensive, theory-informed, and
gender-specific prevention approaches may be effective methods for inhalant use prevention.
Supply-side interventions have not been widely
applied in the United States, but in Australia they have
included adding “bittering” agents to frequently abused
inhalant products, selling gasoline substitutes such as
aviation fuel or Opal gas that are not readily abused, and
modifying products so that they are no longer sought
out by abusers of inhalants.
CONCLUSIONS
More than 22 million Americans age 12 and older have
used inhalants, and more than three-quarters of a million
become new users annually. Inhalant use may lead to
inhalant abuse or dependence in less than 10 percent to
nearly 50 percent of cases, depending on the characteristics of the population studied. There are many acute and
long-term consequences of inhalant use and these can
be catastrophic, but far more needs to be learned about
the full range of maladies associated with use of specific
inhalant products and factors that increase vulnerability
for these disorders.
Although some inroads have been made in understanding the pharmacology and neurobiology of inhalant abuse during the past decade, more needs to be
learned about similarities and differences of specific
abused inhalants. Ethnographic reports suggest that many
youths abuse inhalants in order to achieve a euphoric
state (d’Abbs and MacLean, 2008); survey findings confirm that young people intentionally abuse inhalants to
produce intoxication (Howard et al., 2008); and operant
conditioning and other laboratory paradigms suggest that
inhalants may act as reinforcers in much the same way
as other drugs of abuse (Bowen et al., 2006).
Practitioners should maintain a high index of suspicion for inhalant use, screen for inhalant use and inhalant
use disorders, and intervene early in the course of the
disorder with educational interventions and approaches
that have been used in the treatment of other substance
use disorders (e.g., motivational enhancement and relapse
prevention interventions). This approach seems reasonable until researchers develop and fully evaluate effective
evidence-based interventions for inhalant abusers. Given
the high prevalence of conduct, substance use, mood,
anxiety, and personality disorders among inhalant abusers, it is important that practitioners also avail themselves
of evidence-based interventions for these commonly
co-occurring conditions (Hepner et al., 2007; Woolgar
and Scott, 2005).
RESEARCH REVIEWS—INHALANT USE AND INHALANT USE DISORDERS • 29
ACKNOWLEDGMENT
CORRESPONDENCE
Preparation of this article was supported in part by NIDA
grants DA021405, DA15929, and DA15951.
Matthew O. Howard, University of North Carolina,
Tate-Turner-Kuralt Building, 325 Pittsboro, CB 3550,
Chapel Hill, NC 27599; e-mail: mohoward@email.
unc.edu.
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