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Adults younger than 45 years who reported recently using cannabis were 2 times more likely to have had a heart attack (myocardial infarction), and this link was stronger in frequent users, according to new research in CMAJ (Canadian Medical Association Journal).

These findings add to evidence from earlier studies showing a link between heavy cannabis use and myocardial infarction in people in hospital settings. The current study carefully examines the relationship that frequency of cannabis use and method of consumption have with risk of myocardial infarction in younger adults in the community who aren't at high risk of heart attack because of their age.