Rural and urban differences in marijuana use following passages of medical marijuana laws.

Understanding differences in post-legalization patterns of marijuana between rural and urban environments has the potential to go a long way towards targeting intervention efforts aimed at reducing marijuana use disorders. Data come from the National Survey on Drug Use and Health (NSDUH, 2015-2019, N = 210,392). Survey-weighted multivariable linear and logistic regression analyses were used to assess the relationship between key marijuana-related variables and the status of medical marijuana use in each state with interaction terms for rural versus urban status. Among the entire sample, the prevalence of marijuana abuse and dependence were 0.7% and 1.8%, respectively. Among marijuana users, the average number of days on which marijuana was used was 131.3 (SD = 136.3) days. Those living in states with legalized medical marijuana reported use on a greater number of days (B = 10.69; 95% CI: 5.26, 16.13) with frequency of use increasing as rurality increased, compared to a core based statistical area (CBSA) of ≥1 million: a CBSA of <1 million residents (B = 23.02; 95% CI: 17.38, 28.66) and non-CBSA (B = 37.62; 95% CI: 22.66, 52.58). We also observed lower odds of driving under the influence of marijuana in states where medical marijuana was legal (aOR = 0.86; 95% CI: 0.77, 0.95). We observed an increase in the frequency of marijuana use and a decrease in driving under the influence of marijuana in states with legalized medical marijuana use relative to those states where it remained illegal. We also observed key moderation based on rural-urban status. This body of results suggests that problematic marijuana use may be on the rise following the legalization of marijuana use, but also that corresponding protective attitudes exist.

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