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AN EPIDEMIOLOGIC ANALYSIS OF
CO-OCCURRING ALCOHOL AND TOBACCO USE AND DISORDERS
To
better understand the scope of the adverse consequences of alcohol and tobacco
use and to design more effective treatment and prevention strategies, it is important
to have accurate and reliable information on the prevalence of alcohol and tobacco
use and associated disorders. Many existing prevalence studies, however, are based
on outdated data and diagnostic criteria. Therefore, the 2001–2002 National
Epidemiologic Survey on Alcohol and Related Conditions (NESARC) sought to provide
a current and statistically sound assessment of the prevalence of concurrent alcohol
and tobacco use in the United States. According to Drs. Daniel E. Falk, Hsiao-ye
Yi, and Susanne Hiller-Sturmhöfel, the survey data indicate that 27.5 percent
of men and 16.4 percent of women used both alcohol and tobacco, and 4.1 percent
of men and 1.8 percent of women had concurrent alcohol use disorders and nicotine
dependence. The prevalence of alcohol and tobacco use depended on both age and
ethnic group. These results suggest that some population subgroups may be at particular
risk for problems from drinking and smoking. Identifying these high-risk groups,
such as younger men and Native Americans/Alaskan Natives, can help health care
policymakers and treatment planners create more focused treatment and prevention
strategies.
CO-OCCURRING RISK FACTORS FOR
ALCOHOL DEPENDENCE AND HABITUAL SMOKING
Epidemiologic
studies have shown that people who are dependent on alcohol are three times more
likely to also be dependent on nicotine, and people who are dependent on nicotine
are four times more likely to be dependent on alcohol compared with the general
population. Genetic factors play a significant role in both alcohol and nicotine
dependence, and studies in twins have shown that people with family histories
of alcohol and nicotine dependence are 50 to 60 percent more likely to develop
problems with alcohol and smoking. In this article, Drs. Richard A. Grucza and
Laura J. Bierut review findings from the Collaborative Study on the Genetics of
Alcoholism (COGA) that have identified several chromosomal regions and specific
genes that may contribute to the development of alcohol dependence and habitual
smoking. Although some of these genetic factors are specific to dependence on
one drug, others are associated with dependence on both drugs.
ALCOHOL’S
ACTIONS ON NEURONAL NICOTINIC ACETYLCHOLINE RECEPTORS
Because
alcohol and nicotine often are used together, it is likely that they act through
common mechanisms in the brain. In this article, Ms. Tiffany J. Davis and Dr.
Christopher M. de Fiebre report that one of these mechanisms involves nicotinic
acetylcholine receptors (nAChRs), which mediate the actions of nicotine. Researchers
have demonstrated that alcohol acts on some nAChR subtypes but has little effect
on others. In chronic smokers, alcohol may alter the effects associated with smoking
by acting on nAChRs in the brain, reversing desensitization to nicotine. Additionally,
both alcohol and nicotine can lead to changes in the number of some nAChRs; further
research may show whether these changes are responsible for the development of
cross-tolerance between alcohol and tobacco. Studies also suggest that natural
variation in the genes that code for different subtypes of nAChRs may be associated
with sensitivity to alcohol and to nicotine. Finally, the presence of some nAChR
receptors may protect against alcohol’s toxic effects on the nervous system.
BIOLOGICAL PROCESSES UNDERLYING CO-USE OF
ALCOHOL AND NICOTINE
Alcohol and nicotine often
are used together despite the fact that their effects and mechanisms of action
are quite different. Nicotine is classified as having stimulant effects and acts
on the brain by directly binding to and activating a molecule called the nicotinic
acetylcholine receptor. Alcohol, on the other hand, is classified as a depressant
and does not directly bind to any one receptor site. In this article, Drs. Douglas
Funk, Peter W. Marinelli, and Anh D. Lê describe the biological mechanisms
that may contribute to the concurrent use of alcohol and nicotine. The authors
present evidence that a certain brain signaling system—the mesolimbic dopamine
system—participates in the interaction of alcohol and nicotine in the brain,
mediating the reinforcing and rewarding effects of both drugs. Another biological
factor that may contribute to co-occurring alcohol and nicotine use is cross-tolerance—that
is, reduced sensitivity to one drug resulting from chronic use of another drug—which
may result in increased use of either drug. Finally, the authors present evidence
that genetic factors may predispose people to the co-use of alcohol and nicotine.
CANCER
RISK ASSOCIATED WITH ALCOHOL AND TOBACCO USE
Alcohol
and tobacco, independently, take an enormous toll on public health; moreover,
a growing body of evidence suggests that these substances might be especially
harmful when they are used together. As Drs. Claudio Pelucchi, Silvano Gallus,
Werner Garavello, Cristina Bosetti, and Carlo La Vecchia report, both alcohol
and tobacco place users at risk for certain cancers, particularly those of the
upper aero-digestive tract (i.e., the oral cavity, throat [pharynx], voice box
[larynx], and esophagus), and risk of these cancers typically increases with the
amount of alcohol or nicotine consumed. Furthermore, in many cases combined use
of both drugs increases the effects on risk. Overall, combined use of alcohol
and tobacco accounts for approximately 80 percent of oral and pharyngeal cancer
cases in men and about 65 percent of cases in women. Similarly, more than 80 percent
of esophageal cancer cases in Europe and the Americas can be attributed to combined
alcohol and tobacco use. Some studies also have reported that alcohol and tobacco
may work synergistically to increase the risk of liver cancers; however, more
research is needed to explore this issue.
THE
EFFECTS OF SMOKING AND DRINKING ON CARDIOVASCULAR DISEASE AND RISK FACTORS
Smoking
and excessive alcohol consumption, independently, have been shown to have similar,
often negative, effects on some forms of cardiovascular disease; however, several
factors make this a complicated issue. In this article, Dr. Kenneth J. Mukamal
examines how, although smoking increases the risk for all forms of cardiovascular
disease, moderate drinking has been shown to decrease the risk for heart attacks,
ischemic strokes, and congestive heart failure but increase the risk for hemorrhagic
stroke. In addition, there is relatively little evidence that the effects are
worse when smoking and drinking occur together than would be expected from their
independent effects.
TOBACCO CESSATION TREATMENT
FOR ALCOHOL-DEPENDENT SMOKERS: WHEN IS THE BEST TIME?
Many
people with alcohol use disorders also smoke. In population-based studies of adults
who abuse alcohol or who are alcohol dependent, 33 to 44 percent smoke, and in
the population of adults seeking treatment from alcohol abuse and dependence,
up to 80 percent are smokers. In this article, Drs. Molly Kodl, Steven S. Fu,
and Anne M. Joseph review the evidence regarding the effects of smoking cessation
treatment on alcohol treatment outcomes and the advantages of simultaneous tobacco
treatment versus treating alcohol and nicotine dependencies independently. Although
many smokers in alcohol treatment programs express the desire to quit smoking,
the question of when this should be done is debatable.
SMOKING
CESSATION AND ALCOHOL ABSTINENCE: WHAT DO THE DATA TELL US?
People
who both drink and smoke heavily are more likely to die of complications from
smoking than from alcohol. However, many alcoholism treatment programs—even
those that address multiple addictions—are unlikely to address cigarette
smoking. According to Drs. Suzy Bird Gulliver, Barbara W. Kamholz, and Amy W.
Helstrom, this reluctance to treat both addictions results from widespread myths
about alcohol and nicotine dependence, including the notion that quitting both
alcohol and tobacco is too difficult for patients. However, the authors show that
efforts to quit smoking may actually improve alcohol-related outcomes: according
to the authors, smoking cessation intervention is associated with a 25 percent
greater likelihood of abstinence from alcohol and other drugs in the long term.
Reasons for this correlation remain largely unexplored but may include greater
clinical contact time (patients receive more treatment because they are being
treated for two disorders rather than one), reduced exposure to cues that trigger
substance use, relapse prevention and/or coping skills practice, increased mastery
or self-efficacy, and broader healthy lifestyle choices.
TREATING
SMOKING DEPENDENCE IN DEPRESSED ALCOHOLICS
Compared
with the general population, smokers with alcohol dependence or other psychiatric
disorders have an increased risk of adverse health consequences, a higher mortality
rate, and a lower treatment success rate. Research has shown that alcohol and
nicotine cravings positively correlate with depression and anxiety, making it
difficult to treat each condition separately. For example, people who are trying
to stop using alcohol often turn to nicotine in response to the discomfort associated
with the urge to drink and to improve their mood. In addition, alcohol and nicotine
have been shown to interact with certain brain chemicals known as central opioid
peptides, which induce pain relief and feelings of euphoria. In this article,
Drs. Nassima Ait-Daoud, Wendy J. Lynch, J. Kim Penberthy, Alison B. Breland, Gabrielle
Marzani-Nissen, and Bankole A. Johnson describe pharmacotherapeutic and psychotherapeutic
options for treating co-occurring nicotine and alcohol dependence and psychiatric
disorders and discuss the limitations of these treatments as well as introduce
new approaches.
CIGARETTE SMOKING AMONG ADOLESCENTS
WITH ALCOHOL AND OTHER DRUG USE PROBLEMS
Smoking
is extremely common among youth diagnosed with alcohol and other drug (AOD) use
disorders. However, studies of smoking cessation efforts in this population are
rare. In this article, Drs. Mark G. Myers and John F. Kelly describe developmental
differences between adolescents and adults that create special challenges in treating
adolescent tobacco dependence. According to the authors, interventions that target
youth must take into account special considerations, such as the importance of
peer influences for adolescents and some adolescents’ lack of motivation
to quit. (Adolescents, who are less likely than adults to experience tobacco-related
health problems, also tend to be less motivated to quit smoking.) The authors
suggest that client-centered, motivation-enhancing tobacco interventions, when
modified with these considerations in mind—for example, by emphasizing group
over individual interventions and educating patients about the effects of tobacco
and nicotine—can be effective in helping adolescents quit smoking and are
not detrimental to AOD-related treatment outcomes.
BARRIERS
AND SOLUTIONS TO ADDRESSING TOBACCO DEPENDENCE IN ADDICTION TREATMENT PROGRAMS
Despite
the high prevalence of smoking among people recovering from addiction, tobacco
dependence is rarely addressed in addiction treatment programs. In this article,
Drs. Douglas M. Ziedonis, Joseph Guydish, Jill Williams, Marc Steinberg, and Jonathan
Foulds identify and address barriers to treating tobacco dependence among patients
in addiction treatment programs. These barriers include the staff’s reluctance
to participate and lack of training, “clinical lore” or misinformation
about tobacco (such as the myth that quitting tobacco will worsen other substance-related
outcomes), and lack of resources. According to the authors, programs must be modified
to recognize and treat tobacco dependence—for example, by screening for
tobacco use, offering nicotine replacement therapies and smoking cessation medication
on inpatient units, and bundling costs so that programs can bill tobacco dependence
treatment under the primary disorder. Steps to change can be as simple as forbidding
smoking on the premises of treatment facilities, not allowing staff members to
smoke with patients, and changing the name of smoking breaks to simply “breaks.”
INTEGRATING
TOBACCO DEPENDENCE TREATMENT AND TOBACCO-FREE STANDARDS INTO ADDICTION TREATMENT:
NEW JERSEY’S EXPERIENCE
New Jersey was the
first State to require that residential addiction treatment facilities assess
and treat patients for tobacco dependence and maintain smoke-free grounds. In
this article, Drs. Jonathan Foulds, Jill M. Williams, Bernice Order-Connors, Nancy
Edwards, Martha Dwyer, Anna Kline, and Douglas M. Ziedonis review this policy
change and its implementation and effects. The authors found that treatment for
tobacco dependence can be successfully implemented in addiction treatment programs
through policy regulation, training, and the integration of nicotine replacement
therapy into treatment. The new regulations did not lead to patients leaving treatment
early; in fact, two-thirds of smokers surveyed wanted to quit. Staff members were
often resistant to the new policy change, and implementing smoke-free grounds
was the most challenging aspect of the change. The smoke-free policy was not strictly
enforced, which the authors suggest may have compromised its effectiveness.
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