FILE – In this April 10, 2018, file photo, a high school principal displays vaping devices that were confiscated from students in such places as restrooms or hallways at the school in Massachusetts. U.S. health officials are scrambling to keep e-cigarettes away from teenagers amid an epidemic of underage use. But doctors face a new dilemma: there are few effective options for weening young people off nicotine vaping devices like Juul. (AP Photo/Steven Senne, File)