Experts warn that flavored e cigarettes can cause irreversible lung damage, as seen in a U.S. teenager who developed "popcorn lung"a severe and permanent condition called bronchiolitis obliteransafter secretly vaping for three years. Vaping Linked to Permanent Lung Damage Ashok Yadav posted on the topic LinkedIn A Warm, Buttery Flavor and a Risk of Irreversible Lung Damage Vape appeal Australian Medical Association (NSW) Life threatening bronchiolitis related to electronic cigarette use in a Canadian youth