Additional Study Information: The Center for OCD and Related Disorders at New York State Psychiatric Institute/Columbia University Medical Center is seeking individuals aged 18+ with obsessive-compulsive disorder (OCD) to participate in a survey regarding their experiences with marijuana/cannabis. We hope this study will lead to increased understanding of how these substances affect people who suffer from OCD, so that we may improve OCD treatments in the future. Participation takes about 20 minutes and all participants will be entered into a raffle to receive a $100 Amazon gift card. No identifying information will be collected as part of this research, and all responses will be kept confidential. You can take the survey by copying and pasting this link into your browser: https://www.surveymonkey.com/r/CannabisOCD