Adolescents who regularly use cannabis will record their cannabis use in real-time via a mobile app for two weeks. Participants will be asked to report the method (i.e., joints, blunts, dabs), estimated quantity, and estimated potency of their recent cannabis use. In addition to monitoring cannabis use in real-time, participants will complete other assessments on the mobile app five times per day. Participants will attend three in-person office visits (remote participation is also possible).