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A review published in the July 2026 issue of Trends in Cardiovascular Medicine found conflicting evidence linking cannabis use to heart attacks, strokes, coronary artery disease and heart failure. The most consistent association was with heart rhythm problems, but varied cannabis products and patterns of use, along with other substance use, make the effects difficult to establish.
A review of studies published from 2014 through mid-2025 found conflicting evidence about whether cannabis use is linked to heart attacks, strokes, coronary artery disease or heart failure, while the most consistent association was with heart rhythm problems. Published in the July 2026 issue of Trends in Cardiovascular Medicine, the review highlights uncertainty as cannabis use becomes more common and advises caution, particularly for people with heart disease or its risk factors.
The review examined research on cannabis and cardiovascular health, including use of products containing tetrahydrocannabinol (THC) and cannabidiol (CBD). Its authors found conflicting results for several major heart conditions. The review identified heart rhythm problems as the area where studies most consistently reported an association, but that finding does not by itself establish that cannabis causes those problems.
Researchers face difficulties comparing results because cannabis can be smoked, vaped or ingested, and people differ in the amount and frequency of use. Products also contain varying ratios of THC and CBD. The report describes THC as increasing heart rate, blood pressure and the heart’s oxygen demand; CBD may have different effects, including possible reductions in inflammation and anxiety.
Another complication is that people who use cannabis may also use tobacco, alcohol or opioids. That overlap makes it harder for studies to separate cannabis’s effects from other factors. The report does not establish a single level of use, product type or route of consumption that is safe for every person’s heart.
Heart Rhythm Findings Lead the Evidence
The review matters because it distinguishes a recurring signal from conclusions the evidence cannot yet support. Heart rhythm problems were the most consistent association across the research assessed, but evidence on heart attacks, strokes, coronary artery disease and heart failure remained mixed. Readers should not interpret an association as proof that cannabis caused a cardiovascular event.
The caution is particularly relevant to people who already have heart disease or cardiovascular risk factors, because THC can raise heart rate, blood pressure and the heart’s oxygen demand, according to the report. The review does not quantify an individual person’s risk or show that all cannabis products have the same effects. It does, however, underline why product contents and patterns of use matter when considering possible heart impacts.
The report also points to changing patterns of use. National surveys cited in the source material indicate that daily or near-daily cannabis use is now more common than daily or near-daily alcohol use. Use has been most prevalent among younger males, while recent trends suggest increases among older adults and females. As use spreads across age groups, questions about cardiovascular effects become relevant to more people.
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Why Cannabis Studies Are Difficult
The review considered research published between 2014 and mid-2025, offering a summary of evidence gathered amid broader cannabis use following legalization in many parts of the United States. The review addressed cannabis and several cardiovascular outcomes rather than focusing on one condition alone.
The studies do not necessarily examine identical exposures. Someone who smokes cannabis may differ from someone who ingests it, and products can vary in their THC and CBD content. Frequency and dose also vary. In addition, overlapping tobacco, alcohol or opioid use can complicate attempts to identify cannabis-specific effects.
An accompanying editorial raised questions about how risk might differ by age, including whether use during adolescence carries different cardiovascular implications from use later in life, when heart disease risk is higher. The review does not resolve that comparison. The report identifies higher-quality data as necessary to clarify the evidence.
“Heart risks from cannabis remain hazy but warrant caution.”
— Julie Corliss, executive editor of Harvard Heart Letter, as summarized in the Seniors Guide report
Cause, Dose and Age Remain Unresolved
The review found conflicting evidence for links to heart attacks, strokes, coronary artery disease and heart failure. It also does not establish whether cannabis itself causes the rhythm problems reported in studies, or how risk may vary by dose, frequency, product composition or method of use.
The role of other substances remains difficult to separate from cannabis exposure. The source material also does not provide a single risk estimate applicable to individual users, nor does it settle whether cardiovascular effects differ between adolescents and older adults. Those are among the questions that need better-quality research.
Further Research Needed on Heart Risks
The review and accompanying editorial call attention to the need for higher-quality data on cannabis use and cardiovascular outcomes. Future research will need to account for how cannabis is used, how often and in what quantity, as well as differences in THC and CBD content and use of other substances.
Until clearer evidence is available, the report advises people who use cannabis to act with caution, especially if they have heart disease or risk factors. It does not provide individualized medical advice or claim that cannabis will cause a heart problem. People weighing cannabis use alongside a heart condition or cardiovascular risk should discuss medical decisions with a qualified health professional.
Key Questions
Does the review show that cannabis causes heart disease?
No. The review found conflicting evidence on links to heart attacks, strokes, coronary artery disease and heart failure. An association reported in studies does not establish cause and effect.
The review described heart rhythm problems as the most consistent association in the research it examined. It did not say that cannabis was proven to cause those problems.
Why is it hard to study cannabis and heart health?
People use cannabis by different methods and at different doses and frequencies, and products vary in their THC and CBD ratios. Tobacco, alcohol and opioid use can also make it difficult to isolate cannabis-specific effects.
Who does the report advise to be especially cautious?
The report advises caution for people who use cannabis, particularly those with heart disease or risk factors for it. It does not quantify personal risk; medical decisions should be discussed with a qualified health professional.
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