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. Academy of Cannabis Science Vaping Possible Negative Effects on Lungs: State of the Art From Lung Capacity Alteration to Cancer Cureus What Happens When You Quit Smoking & Start Vaping Vapourcore Vaping increases the risk of lung disease by a third: U.S. study Reuters Eastside Vaping on the rise