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Drug Alcohol Depend. 2016 Sep 1;166:32-8. doi: 10.1016/j.drugalcdep.2016.06.016. Epub 2016 Jul 18.

Medical marijuana legalization and cigarette and marijuana co-use in adolescents and adults.

Author information

1
Center for Tobacco Control Research and Education, Cardiovascular Research Institute, University of California, San Francisco, 530 Parnassus Avenue, San Francisco, CA 94143, USA. Electronic address: julie.wang@ucsf.edu.
2
Center for Tobacco Control Research and Education, Cardiovascular Research Institute, University of California, San Francisco, 530 Parnassus Avenue, San Francisco, CA 94143, USA; Department of Psychiatry and Weill Institute for Neurosciences, University of California, San Francisco, 401 Parnassus Avenue, Box RAM 0984, San Francisco, CA 94143, USA.
3
Center for Tobacco Control Research and Education, Cardiovascular Research Institute, University of California, San Francisco, 530 Parnassus Avenue, San Francisco, CA 94143, USA.
4
Center for Tobacco Control Research and Education, Cardiovascular Research Institute, University of California, San Francisco, 530 Parnassus Avenue, San Francisco, CA 94143, USA; Department of Physiological Nursing, University of San Francisco, 2 Koret Way, Box 0610, San Francisco, CA 94143, USA.

Abstract

BACKGROUND:

Medical marijuana legalization is associated with a higher prevalence of marijuana use which may affect cigarette use and nicotine dependence in co-users. In the present study, we examined relationships between statewide legalization of medical marijuana and prevalence of cigarette and marijuana co-use and nicotine dependence in co-using adolescents and adults.

METHODS:

Data were analyzed from the 2013 National Survey on Drug Use and Health. We compared cigarette and marijuana co-use in the past 30days across age categories (12-64 years) by statewide medical marijuana legalization. Logistic regression models were used to estimate the odds of having nicotine dependence among current cigarette smokers who also reported past 30-day marijuana use and "ever but not current" marijuana use (vs. "never" use) adjusting for covariates including statewide legalization of medical marijuana.

RESULTS:

Overall, 5.1% of the sample reported past 30-day cigarette and marijuana co-use and a higher proportion of co-users resided in states where medical marijuana was legal compared to illegal (5.8% vs. 4.8%; p=0.0011). Co-use was associated with greater odds of having nicotine dependence compared to cigarette-only use across age categories. Odds were highest and up to 3-times higher in adolescents aged 12-17 years (OR=3.54; 95%CI: 1.81-6.92) and adults aged 50-64 years (OR=3.08; CI: 1.45-6.55).

CONCLUSION:

Marijuana policy could inadvertently affect cigarette and marijuana co-use and pose challenges to tobacco cessation.

KEYWORDS:

Cigarette; Co-use; Marijuana; Medical marijuana policy; Nicotine dependence; Tobacco control

PMID:
27460859
PMCID:
PMC4983542
DOI:
10.1016/j.drugalcdep.2016.06.016
[Indexed for MEDLINE]
Free PMC Article

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