E cigarette use is linked to higher heart attack risk, especially in former smokers Vaping not prior smoking is associated with changes in gene regulation linked to disease Study: heated tobacco less harmful than cigarettes, but much more so than vapes Vaping Post Vaping and Oral Health: Can Dentists Tell You Vape? Secondhand vape plumes could form lung damaging radicals American Chemical Society Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times