Objectives: To assess the influence of media use and perceived risk on marijuana use outcomes. Methods: With survey data from 750 US young adults, structural equation modeling tested how attitudes, behaviors, and behavioral intention specific to marijuana use are influenced by perceived personal and societal risk of marijuana use, media campaign exposure, and news use. Results: Perceived societal risk had significant effects, though not as strong as perceived personal risk. Campaign exposure had favorable effects whereas those of news use were mixed. Conclusions: Perceived personal risk and perceived societal risk should be considered when designing preventive media campaigns.