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. Health experts are raising the alarm and we need to pay attention. Popcorn lung, medically known as bronchiolitis obliterans, is a serious and permanent lung condition linked to chemicals that have Uncovering Hidden Risks: Popcorn Lung and Vaping Dangers Bronchiolitis obliterans Wikipedia