Flavored e cigarettes may lead to permanent lung damage, experts warn. A U.S. teenager was diagnosed with bronchiolitis obliteranscommonly known as "popcorn lung"after vaping in secret for three years. This rare and irreversible Foger 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 Community Request Diacetyl Center for Research on Ingredient Safety Diacetyl notice! : r Vaping