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Medicinal use of marijuana is increasingly common in the U.S. despite limited evidence of efficacy and ambiguous boundaries between medicinal and recreational use (NEJM JW Psychiatry Feb 2017 and JAMA 2017; 317:209). In this survey-based study, researchers examined use in outpatients from a Seattle cancer center after state legalization of marijuana.
Of 2737 patients approached, 926 responded (34%; median age, 58; >50% college-educated; 66% with solid tumors). About 66% had a history of lifetime marijuana use, and 24% were “active users.” Although 74% would have preferred to learn about marijuana from their cancer team, most got their information elsewhere (e.g., friends, websites, or other patients).
Among active users, two thirds used marij…