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To the Editor: Approximately 17%-80% of people with schizophrenia use cannabis, and one-quarter have a lifetime cannabis use disorder. Withdrawal symptoms are clinically significant because they may act as negative reinforcement for relapse to cannabis use. We previously published a cross-sectional survey on the experience of cannabis withdrawal (assessed with the Marijuana Quit Questionnaire [MJQQ]) in 120 adults with schizophrenia who made a "serious" (self-defined) quit attempt with no formal treatment while not in a controlled environment (index quit attempt).
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