A recent case involving a U.S. teenager who developed Bronchiolitis Obliterans, commonly called popcorn lung, after three years of secretly vaping has raised serious concerns about the risks of e cigarettes. This irreversible Popcorn Lung: A Dangerous Risk of Flavored E Cigarettes American Lung Association Does vaping cause lung cancer? UT MD Anderson Vaping, Diacetyl, and Popcorn Lung: Is the Threat Real? Vaping360