Julie B Wang1, Danielle E Ramo2, Nadra E Lisha3, Janine K Cataldo4. 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.
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.
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