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. It's a Fact. Vaping Can Cause Popcorn Lung Poster ToucanEd How E Cigarettes Affect Your Lungs: Results of an Online Survey of Users E Cigarette Direct Photos Show Vaping Lung Damage Like Blisters and Lung Collapse Business Insider What Does Vaping Do to Your Lungs? Johns Hopkins Medicine E cigarettes lower immunity to flu and other germs