What's the Best Vape for a Heavy Smoker? What You Need to Know About E Cigarettes and Vaping NYC Health + Hospitals FDA permits the marketing of an e cigarette for the first time, paving the way for vaping products to be legally sold in the U.S. Roswell Park Comprehensive Cancer Center Buffalo, How Hard is it to Quit Vaping? Hanley Center Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times How safe is vaping? UCLA