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Cannabis use is potentially associated with increased harms and varied effects on pain control. Zhang et al performed a retrospective cohort study in patients having non-cardiac surgery and compared patients who self-report cannabis use to matched controls.1 There were no differences in the composite outcome (death, myocardial infarction, stroke, cardiac or respiratory arrest, intensive care unit admission), and in the secondary outcomes of new-onset arrhythmias, pain control or nausea–vomiting.
Contributors HS: Conception and study design, drafting the article, final approval and creation of infographic. BHZ: Data collection, drafting the article and final approval. HS, NS, MC, DB and LR: Data collection and final approval. LW: Study design, data analysis and final approval.
Funding This project received funding from the McMaster Medical Student Research Excellence Scholarship dated March 29, 2019.
Competing interests None declared.
Provenance and peer review Commissioned; internally peer reviewed.