A new study published in the journal JAMA Cardiology has shed light on the distinct effects of smoking and edibles on cardiovascular health. The research, conducted by a team of scientists at the University of California, San Francisco (UCSF), found that consuming cannabis in edible form may have a more detrimental impact on cardiovascular health over time compared to smoking it.
Study Overview
The study involved 1,000 participants who were divided into three groups:
- Cannabis smokers
- THC edible users
- Non-users
Researchers used vascular function tests to assess blood vessel dilation in each group and collected blood samples to analyze nitric oxide production in endothelial cells.
Key Findings
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Impaired Blood Vessel Dilation: Both cannabis smokers and THC edible users exhibited impaired blood vessel dilation compared to non-users. The degree of impairment was directly linked to the frequency or intensity of cannabis use; more frequent users experienced greater impairment.
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Nitric Oxide Production: Blood samples from individuals who smoked cannabis showed significant inhibition of nitric oxide production in endothelial cells. Nitric oxide is crucial for maintaining healthy blood vessels by promoting vasodilation (the widening of blood vessels). In contrast, samples from edible consumers and non-users did not affect cell function.
Expert Insights
According to Matt Springer, an associate professor at UCSF’s Cardiovascular Research Institute, "It’s like we’re seeing two different pathways," indicating that the effects of smoking cannabis differ from those of consuming it in edible form.
Dr. Robert Kloner, director emeritus at Huntington Medical Research Institutes’ Cardiovascular Division, agrees that there are differences between smoked marijuana and edibles but emphasizes the need for more research to understand their relative risks for heart disease patients with pre-existing conditions such as high cholesterol or diabetes.
Implications for Future Research
This study highlights the need for further research into how different methods of cannabis consumption affect cardiovascular health over time. While some studies suggest that moderate marijuana use may lower risk factors for heart disease, others raise concerns about its potential negative impacts.
Conclusion
Cannabis consumption has become increasingly popular worldwide since legalization began spreading across states, starting with Colorado in 2014. More than half of U.S. adults now live in areas where recreational cannabis is legal. However, there remains much uncertainty surrounding its long-term effects, particularly on cardiovascular health.
The authors note that while their findings are promising, further investigation is needed before drawing any definitive conclusions regarding the relationship between marijuana use patterns and cardiovascular outcomes. They emphasize caution when interpreting these results, as the study only included participants aged 18-65 years, and older adults may experience different effects. Additionally, many individuals consume multiple substances simultaneously, making it difficult to isolate specific risks associated with each substance.
Future studies should aim to include diverse populations and control for confounding variables such as socioeconomic status and education level.

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