| Recruiting | N/A | 600 | US | Usual Care, QUIT Intervention (doctor brief advice, video doctor, health coaching sessions at 2- and 6-weeks), QUIT-Mobile (QUIT Intervention plus weekly mobile-web app or text message weekly self-monitoring, automated feedback over 12 months) | University of California, Los Angeles, National Institute on Drug Abuse (NIDA), University of Arkansas, Medical University of South Carolina | Drug Use | 12/25 | 03/26 | | |