E cigarettes: Discovering Myths and Facts E Cigarettes: A 'Gateway Drug' to Addiction 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, E Cigarettes Are Effective at Helping Smokers Quit, a Study Says The New York Times Teens who use flavored e cigarettes more likely to start smoking Harvard Health