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. Popcorn Lung: The Deadly Secret in Your Vape! Did you know that the sweet, tempting flavor in your e liquid could be hiding a chemical called Diacetyl? This chemical, which tastes Does Vaping Cause Popcorn Lung? 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