Cannabis use independently associated with higher heart attack risk in French nationwide study

Among all illicit drugs evaluated, only cannabis use was significantly associated with higher AMI risk (HR 1.32, 95% CI 1.09-1.59). However, after propensity-score matching 738,899 AMI patients, those with illicit drug use history had similar rates of death, cardiovascular death, stroke, and heart failure compared to non-users.

Researchers used the entire French hospital-discharge database. Phase 1 analyzed 3,381,472 patients hospitalized in 2013 with 5-year follow-up to identify AMI predictors. Phase 2 analyzed 738,899 AMI patients from 2010-2018, matching 3,827 illicit drug users to non-users by propensity score.

This is one of the largest studies to examine cannabis and heart attack risk at a population level. The finding that cannabis independently predicted AMI but not worse outcomes after AMI adds nuance to the cardiovascular risk discussion.

The dissociation between increased AMI incidence but similar post-AMI prognosis suggests cannabis may trigger acute cardiac events rather than worsen underlying cardiac disease, though more research is needed to confirm this interpretation.

Administrative database may undercount illicit drug use. Cannot distinguish frequency or method of cannabis use. Observational design cannot prove causation. French population may not generalize globally.