CSDE Affiliate Katarina Guttmannova (Psychiatry and Behavioral Sciences) and co-authors recently published two articles in the American Journal of Preventive Medicine examining cannabis-related risks across age groups. The first study drew on cross-sectional survey data from more than 200,000 high school students in Washington and Oregon between 2016 and 2023, and found that proximity to cannabis retail outlets,  particularly within one mile of a school, was associated with increased cannabis use, elevated risk factors, and reduced protective factors among adolescents. The second used longitudinal data (2015-2022) from over 15,000 young adults in Washington State and found a nonmonotonic relationship between cannabis use frequency and alcohol use. While occasional cannabis use was associated with more drinking, daily or near-daily cannabis use was associated with less drinking than occasional use, suggesting possible substance use specialization at higher frequencies.