Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times Chemicals E Cig Vapor Or Secondhand Smoke: Which Is Worse For You? Don't Be Fooled, E cig Aerosol Is Not Harmless for Kids American Lung Association Have you ever breathed in secondhand vapor from a vape? What exactly are you inhaling? It turns out it's a lengthy list of chemicals. FULL STORY According to the American Heart Association, the risks of secondhand smoke from vapes are still being discovered. Learn about the dangers of secondhand smoke from vapes.