Anne M Fairlie, Brian H Calhoun, Charles Fleming, Miranda L M Delawalla, Griselda Martinez, Max A Halvorson, Isaac C Rhew, Jason R Kilmer, Katarina Guttmannova
OBJECTIVE: It is unknown whether age-related decreases in substance use (maturing out) are observed in the legalized cannabis context. This study evaluated age-related changes in past-month alcohol use frequency, cannabis use frequency, and any simultaneous alcohol and marijuana/cannabis (SAM) use among young adults who engaged in the respective substance use behavior. METHOD: Young adults, residing in Washington State at enrollment (N=6,509; 68.3% female; ages 18-25), provided 3-5 years of annual data in a longitudinal, cohort-sequential design from 2015 to 2019, a period after nonmedical cannabis was legalized and implemented...
August 10, 2024: Journal of Studies on Alcohol and Drugs