Perceived prevalence of peer marijuana use: changes among college students before and after Oregon recreational marijuana legalization

Background: Oregon students' rates of marijuana use have increased following recreational marijuana legalization (RML), but the relation between RML and students' perceived peer use of marijuana - or descriptive norms - is unknown. Objectives: This study examined whether perceived peer use of marijuana changed more following RML for college students in Oregon than in states without RML. Methods: Repeated cross-sectional data were collected from...