Trends in Cannabis and Alcohol Use by Sexual Identity in the 2015-2019 National Survey on Drug Use and Health

Objective: Sexual minority individuals are at substantially elevated risk for both cannabis use disorder (CUD) and alcohol use disorder (AUD). Although recent increases in the legalization of cannabis have been linked to increases in cannabis use among the general population, few studies have examined if changes in cannabis use and CUD vary by sexual identity. The purpose of the current study was to examine sexual identity differences in trends for CUD and compare them to trends for AUD. Method: We used data from 2015-2019 National Survey on Drug Use and Health to examine annual prevalence and yearspecific disparities in cannabis use, CUD, heavy episodic drinking, and AUD. We also examined sex-specific sexual identity differences in linear trends for these substance use outcomes over this 5-year period. Results: All groups except lesbian females experienced significant increases in cannabis use rates from 2015 to 2019. Heterosexual males, heterosexual females, and bisexual females also experienced significant increases in CUD rates. In contrast, no group exhibited significant increases in heavy episodic drinking or AUD rates. Bisexual women exhibited some of the largest year-specific disparities in cannabis use and CUD as well as the largest growth in disparities across time. Conclusions: The few changes in heavy episodic drinking and AUD alongside numerous changes in cannabis use and CUD suggest that changes in cannabis use may be attributable to legalization of cannabis use in many states during this period. Given profound disparities and increasing rates of CUD affecting bisexual females, further research is needed to identify factors that may explain their disproportionate burden. (J. Stud. Alcohol Drugs, 84, 874-883, 2023)