• Philip T Veliz, Sean Esteban McCabe, Rebecca J Evans-Polce, and Carol J Boyd.
• Center for the Study of Drugs, Alcohol, Smoking and Health, University of Michigan, School of Nursing, 400 North Ingalls Street, Ann Arbor, MI, 48109, USA. Electronic address: ptveliz@umich.edu.
• Drug Alcohol Depend. 2020 Nov 1; 216: 108308.

BackgroundThe purpose of this study was to determine the developmental course of marijuana use among adolescents based on their history of cigarette and e-cigarette use among a national U.S. sample of adolescents who were followed over a four year time-period.MethodsThe data for this study used four waves of the Population Assessment of Tobacco and Health (PATH) Study provided by a panel of 12 to 17-year-olds at Wave 1 (n = 11,059) who completed each of the four annual waves of the adolescent/adult survey. We examined recent use (i.e., past 30-day) of e-cigarettes, cigarettes, and marijuana use at each of the four waves.ResultsRespondents who had a history of non-concurrent dual use (AOR = 1.67, 95 % CI = 1.24, 2.24) and a history of concurrent dual use (AOR = 1.67, 95 % CI = 1.40, 1.99) had greater odds of past 30-day marijuana use when compared to respondents who had a history of past 30-day e-cigarette use only. Interaction effect models found that e-cigarette only users were at lower risk for past 30-day marijuana use at Wave 1, however, the risk of past 30-day marijuana use increased at a faster rate across the four waves for e-cigarette only users when compared to their peers who used cigarettes or a combination of cigarettes and e-cigarettes.ConclusionWhile concurrent and non-concurrent dual use was strongly associated with marijuana use over the study period, marijuana use increased at a faster rate across the four-year span of the study among e-cigarette only users.Copyright © 2020 Elsevier B.V. All rights reserved.

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