F.D.A. Delays Decision on Juul's E Cigarettes but Orders Others Off the Market The New York Times The FDA is allowing vaping brand Juul to keep its e cigarettes on the market. Studies from Juul show its e cigarettes are less harmful for adult smokers, who can benefit from switching completely PDF) Electronic cigarettes: Product characterisation and design considerations Perceived threat and fear responses to e cigarette warning label messages: Results from 16 focus groups with U.S. youth and adults PLOS One Vaping