Most Medical Cannabis Patients Reported Reducing Their Use of Opioids, Sleep, and Anxiety Medications

Online cross-sectional survey of New England dispensary members (n = 1,513). Participants were asked about their medical history, conditions, cannabis experiences, and changes in use of other medications since starting medical cannabis.

The opioid epidemic has driven intense interest in whether medical cannabis could serve as a substitute for prescription opioids. This study provides patient-reported data suggesting substantial medication substitution, particularly for opioids, anxiety medications, and sleep aids. However, the finding that doctors were often unaware of their patients' cannabis use highlights a gap in coordinated care.

This study adds to the substitution hypothesis: that medical cannabis access may reduce use of other substances, particularly opioids. Prior epidemiological research found reduced opioid overdose deaths in states with medical cannabis laws. The patient-reported data here aligns with that ecological finding, though self-report and ecological studies cannot establish causation.

Self-reported, retrospective, cross-sectional design. No verification of actual medication changes through pharmacy records or physician confirmation. Selection bias: dispensary members who found cannabis helpful may be more likely to respond. No control group of patients who tried cannabis and found it unhelpful. "Reduced use" does not necessarily mean "appropriate reduction" since some patients may need their original medications.