quote [ In 2007, health officials in California revealed that numerous workers in local flavoring factories suffered from a rare, life-threatening lung condition called bronchiolitis obliterans, later nicknamed “popcorn lung.” The illness, which scars the air sacs of the lungs and makes breathing difficult, stemmed from exposure to diacetyl, a yellow chemical used to give microwave popcorn its buttery flavor. Now, that chemical is at the center of a new study revealing that it’s harmful in vape liquids as well. ]