A Young Man Had a Heart Attack After Smoking Marijuana | Research

The takeaway

A young man experienced an ST-elevation heart attack caused by acute coronary artery thrombosis shortly after smoking marijuana, treated successfully with emergency angioplasty.

Read this if you want to understand the reported cases linking cannabis use to heart attacks.

Acute coronary thrombosis in a young man following marijuana use

What the researchers found

The case report described a young man who experienced a heart attack (ST-elevation myocardial infarction, or STEMI) after smoking marijuana. Cardiac catheterization revealed acute thrombosis (blood clot) in the left anterior descending artery, which was successfully treated with primary coronary angioplasty (balloon and stent).

The authors noted that while cannabis has well-established effects on the cardiovascular system (increased heart rate, changes in blood pressure), the link between cannabis and heart attack remains limited and controversial. They positioned this case as additional evidence that cannabis may trigger acute cardiac events, possibly through effects on blood clotting, coronary artery spasm, or increased myocardial oxygen demand.

Why it matters

Heart attacks in young people are unusual and often have identifiable triggers. While this case cannot prove cannabis caused the heart attack, the temporal association adds to a small but growing body of case reports linking cannabis use to acute cardiac events.

The numbers in context

One young male patient. ST-elevation myocardial infarction. Acute thrombosis of the left anterior descending coronary artery. Successful primary angioplasty.

How the study worked

Single case report with clinical documentation of the cardiac event, coronary angiography findings, and treatment. The temporal relationship between marijuana smoking and symptom onset was documented.

What this study cannot tell us

A single case report cannot establish that cannabis caused the heart attack. The patient may have had undetected risk factors. The temporal association (marijuana then heart attack) does not prove causation.

How to read the evidence

This is a single case report, the weakest form of clinical evidence. It documents a temporal association but cannot establish causation.

When this study was published

Published in 2008. Subsequent epidemiological studies have attempted to quantify cannabis-related cardiovascular risk, with mixed results.

The bigger picture

This case report is part of a broader collection of cases linking cannabis use to acute cardiovascular events. While case reports cannot establish causation, the accumulation of similar reports has prompted more systematic investigation of cannabis cardiovascular risks.

Questions still open

Through what mechanism might cannabis trigger coronary thrombosis? How common are cannabis-related cardiac events compared to other triggers? Are certain individuals at higher risk?

Common questions

Can marijuana cause a heart attack?

Individual case reports like this one document heart attacks occurring after cannabis use, but they cannot prove causation. Population-level studies suggest cannabis may modestly increase short-term cardiovascular risk, but the overall risk appears to be low for most people.

How might cannabis affect the heart?

Cannabis increases heart rate, can affect blood pressure, and may influence blood clotting. These cardiovascular effects could theoretically trigger a cardiac event in someone with pre-existing risk factors, though definitive evidence remains limited.

Read the original research

Cannabis: a trigger for acute myocardial infarction? A case report.

Journal of cardiovascular medicine (Hagerstown, Md.), 9(7), 725-8

View on PubMed ↗Publisher’s paper ↗

Citation

Cappelli, Francesco; Lazzeri, Chiara; Gensini, Gian Franco; Valente, Serafina. (2008). Cannabis: a trigger for acute myocardial infarction? A case report.. Journal of cardiovascular medicine (Hagerstown, Md.), 9(7), 725-8. https://doi.org/10.2459/JCM.0b013e3282f2cd0d