Matthew A. Nystoriak, Ph.D., and other researchers at the University of Louisville, tested 15 different flavors on human cardiomyocytes, or cells in your heart that make it contract and supply blood to all the areas of your body. The result? When heated and unheated, the chemicals affected the cells’ ability to function.
More specifically, they found that cinnamon flavoring kept the cells from contracting 24 hours after coming in contact, and the clove, floral, and citrus flavorings caused the cells to make the heart beat faster.
“These effects [from the chemicals] are kind of striking because it suggests that if this compound was interacting with the heart muscle itself, it could do something directly to change how that cell actually functions,” Nystoriak said in a statement.
However, the effects of the chemicals in the liquid flavorings above were the most powerful when they were unheated, which is the opposite of what happens to them when you vape, so there’s still more research that needs to be done.
But Matthew L. Springer, Ph.D., who studies how tobacco smoke affects how your vascular system works, cautioned that people who vape should still pay attention to this study.
“They should not assume that e-cigarettes are harmless just because they don’t produce smoke,” he said in a statement. “The best thing that you can inhale is clean air.”