A 2024 study compared traditional cigarettes, nicotine vapes, and nicotine-free vapes. All three impaired vascular function. Nicotine vapes had the worst effect, but nicotine-free ones weren’t far behind. The takeaway? The base ingredients and flavorings themselves are harmful. Dr. Marianna Nabbout, one of the researchers, warned that if a single vape session can immediately impact your blood vessels, long-term use...