It's official. Flavored e cigarettes cause permanent lung damage. And doctors are already seeing it happen. In the United States, a teenager developed something called popcorn lung after secretly vaping for three years. Elf bars: Doctor explains why you shouldn't use disposable vapes Are Geek Bars Safe: A Look At Disposable Vapes And Vaping Risks Canadian teen develops 'popcorn lung' like vaping illness, unlike U.S. patients