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, American Heart Association: Vaping Combined With Smoking Is Likely As Harmful as Smoking Cigarettes Alone Vaping just once raises oxidative stress levels in nonsmokers, increasing disease risk UCLA Largest US study of e cigarettes shows their value as smoking cessation aid 5 Vaping Facts You Need to Know Johns Hopkins Medicine