The New Cannabis–Heart Attack Study Is Not About Cannabis

What ICD codes, hospital admissions, and outdated labels reveal about how we assign risk.

If you only have a minute: This paper examines hospital coding for cannabis use disorder in patients already hospitalized with advanced metabolic liver disease. It shows an association with documented myocardial infarction during admission. It does not measure cannabis dose, route, or causality. The rest of this essay explains why that distinction matters.

The headline lands before the method does

There is a particular kind of quiet that settles in a room when someone says the words heart attack and cannabis in the same breath. I have seen it in clinic, in hospital consults, in family conversations where no one wants to sound alarmist but everyone can feel the ground shift a little. The body already knows what those words mean, even before the mind catches up and asks the obvious question, is this a real signal or just another headline that will be replaced by the next o…