New study reveals the worst e cigarette flavor to inhale and it's a popular one Vapes on black market may contain toxic chemicals, pesticides, harmful flavorings Vaping: The Good, the Bad and the Popcorn Lung MPH Online My Worst Play The Real Cost Vaping is on the rise. While e cigarettes don't contain tobacco, they may still contain many of the same toxic and cancer causing chemicals found in regular cigarettes. This includes: Acrolein (weed