This study examines self-reported quitting strategies used by adult, non-treatment-seeking marijuana smokers. Sixty-five subjects rated the use and effectiveness of thirteen strategies on a self-developed instrument, the Marijuana Quit Questionnaire. The strategies clustered into three categories/factors, whether grouped by principal components analysis, mean helpfulness rating, or frequency of endorsement: Change Environment, Seeking Organized/Professional Help, and Social Support. Changing one's environment was rated as most helpful while seeking help from professionals was the least helpful. Clinicians are likely to see marijuana users in their practice and should be proactive in offering assistance, incorporating the strategies reported here into treatment plans for their marijuana-using patients.