Health & Wellness
Can Cannabis Use Lead to Heart Disease?
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Cannabis use is associated with higher rates of several cardiovascular problems, including heart attack, stroke, and some abnormal heart rhythms. Most of the evidence is observational, so it cannot prove that cannabis caused an event in a particular person. Nevertheless, the accumulating findings warrant caution, especially for people with existing heart disease.
How Cannabis Can Affect the Heart
THC can stimulate the sympathetic nervous system, raise heart rate, and increase the heart’s oxygen demand. Blood-pressure effects can vary; a short-term change after use is not the same as developing chronic hypertension. The American Heart Association’s scientific statement also identifies concerns about blood-vessel function and platelet activation.
Smoking adds exposure to combustion products. CBD has different effects from THC, but laboratory findings about reduced inflammation or changes in blood pressure do not establish that CBD prevents heart attacks. Cannabis should not replace prescribed cardiovascular treatment.
What Newer Studies Show
A 2024 analysis of 434,104 US adults found that daily cannabis use was associated with 25% higher adjusted odds of a reported heart attack and 42% higher odds of stroke compared with no use. This was a cross-sectional survey using self-reported exposure and health outcomes. It cannot establish which came first or predict an individual’s future risk.
A 2025 systematic review of 24 observational studies found the following pooled associations:
| Outcome | Estimated relative risk | 95% confidence interval |
|---|---|---|
| Acute coronary syndrome, including heart attack | 1.29 | 1.05–1.59 |
| Stroke | 1.20 | 1.13–1.26 |
| Cardiovascular death | 2.10 | 1.29–3.42 |
These are relative comparisons, not percentage-point increases in absolute risk. The studies differed in how they measured cannabis exposure and other risk factors; most were cross-sectional, and only one focused on medical cannabis. The findings strengthen concern but do not establish the same risk for every product, dose, or patient.
Arrhythmias and Hypertension Need Separate Assessment
An atrial-arrhythmia meta-analysis published online in 2025 and in a 2026 journal issue combined 14 observational studies. Cannabis use was associated with about 71% higher pooled odds of atrial arrhythmias, including atrial fibrillation and related rhythm disorders. This association cannot prove causation, and it does not mean that 71% of users develop an arrhythmia.
The evidence for chronic hypertension is less consistent. The 2025 CARDIA analysis followed a cohort of 4,328 adults for up to 35 years and found no significant association between cumulative cannabis use and new hypertension. Cumulative exposure was generally low, limiting what the result says about long-term heavy use or today’s high-potency products. It also does not rule out acute cardiovascular effects or other heart outcomes.
Why Product and Medication Details Matter
Removing smoke exposure does not establish that an edible, oil, or vape is cardiovascular-safe. Studies often lack reliable information about THC dose, frequency, route, or changes in use over time. Those gaps make it difficult to identify a safe threshold or compare products confidently.
The American Heart Association also highlights potential drug interactions. THC and CBD can affect the metabolism of medicines, including certain anticoagulants, statins, and drugs used for abnormal heart rhythms. The relevance depends on the specific medicine and cannabis product; a pharmacist or prescribing clinician should assess it rather than a patient changing doses independently.
Bring the product label and describe how often and how much you use, including nonprescription CBD. Mention any chest symptoms, racing heartbeat, dizziness, or fainting. Legal availability and medical authorization do not by themselves demonstrate cardiovascular safety.
When Symptoms Need Urgent Help
Do not assume chest discomfort after cannabis is merely anxiety. The American Heart Association advises calling 911 for possible heart-attack symptoms, including persistent or recurring chest pressure, discomfort spreading to the arms or jaw, or shortness of breath. Cold sweats, nausea, and lightheadedness can also occur. Get emergency help even if you are unsure; do not wait for the cannabis effects to wear off.
For routine care, discuss cannabis alongside tobacco, alcohol, medicines, and established cardiovascular risk factors. The current evidence supports taking possible heart harms seriously while being precise about what observational research can and cannot prove.
