Health experts warn that flavored e cigarettes may lead to permanent lung damage. A U.S. teenager was diagnosed with "popcorn lung" after covertly vaping for three years, resulting in a lifelong, debilitating condition. How E Cigarettes Affect Your Body Science & Tech Spotlight: E cigarettes U.S. GAO Vaping Danger in Spotlight as Lung Injury Cases Mount Methodist Health System Omaha, Council Bluffs, Fremont Vaping lung illnesses: Lab tests find bad chemicals in e cig liquids