Cannabis has been riding high lately. From gummies to tinctures to good old-fashioned joints, it’s often marketed as the ultimate wellness cure-all—good for everything from insomnia to joint pain. But before you declare weed the undisputed champion of holistic health, a new study is dropping a bit of a buzzkill, specifically when it comes to your heart.
According to new research presented at the 2026 Society of Cardiovascular Computed Tomography (SCCT) meeting, there might be a significant link between smoking marijuana and accelerated coronary atherosclerosis.
In non-doctor speak? Weed might be clogging your arteries.
Here is the breakdown of what the researchers found, what it means for you, and the one massive plot twist you need to know about the data.
In the past, most studies on marijuana and heart health relied on general health outcomes and surveys. This time, researchers wanted a closer look. They used CT angiography to directly image the coronary plaque of 51 patients between the ages of 30 and 75.
They split the patients into two groups: 24 individuals with a history of marijuana use (averaging about 7.8 years of use) and 27 nonusers.
When they ran the scans through quantitative plaque analysis software, the differences between the two groups were jarring.
The imaging revealed that the marijuana users had significantly worse heart health metrics across the board:
- Double the Calcium: The Coronary Artery Calcium (CAC) scores for marijuana users were more than double those of nonusers (a median score of 274.1 versus 126.2).
- Massive Plaque Volume: Total plaque volume was nearly four times higher in the cannabis group (747.7 vs. 202).
- Narrowed Arteries: Significant stenosis (dangerous narrowing of the arteries) was found in 70.8% of the marijuana users. In the nonuser group? Just 29.6%.
Because of these findings, the marijuana users in the study were much more likely to need escalated doses of statins (cholesterol-lowering drugs) compared to the nonusers.
Before you throw out your stash in a panic, there is a massive caveat to this study that even the researchers acknowledge: Tobacco.
While the baseline health characteristics of the two groups were mostly similar, there was one glaring discrepancy. A whopping 79.2% of the marijuana users also had a history of using tobacco, compared to just 3.7% of the nonusers.
As we all know, tobacco is a ruthless, well-documented enemy of the cardiovascular system. Because there was so much overlap between weed smoking and cigarette smoking in this specific study, it’s incredibly difficult for researchers to isolate exactly how much of that artery-clogging plaque was caused by marijuana alone, and how much was the tobacco doing what tobacco does best.
Yes, the sample size was small (just 51 people) and the tobacco overlap is a huge confounding factor. However, the sheer volume of plaque and arterial calcification seen in the scans is enough for cardiologists to raise a red flag.
The takeaway? We can’t assume that smoking marijuana gets a free pass when it comes to cardiovascular health. If you have a history of using marijuana (especially if you’ve ever mixed it with tobacco), don’t keep your doctor in the dark. Be honest about your habits so your healthcare provider can order the right early cardiovascular risk assessments and, if necessary, get you started on preventative therapies to keep your heart pumping strong.
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