What is Popcorn Lung? Popcorn Lung is a serious, permanent lung disease caused by inhaling harmful chemicals like diacetyl, sometimes found in flavored vapes. Tips for Parents & Caregivers: Talk E Cigarettes and Vaping PPAC Central Popcorn Lung: A Dangerous Risk of Flavored E Cigarettes American Lung Association Vaping: Get the Facts. Protect Your Future Anne Arundel County Health Department Popcorn lung: Causes, symptoms, and treatment What is Popcorn Lung? Popcorn Lung is a serious, permanent lung disease caused by inhaling harmful chemicals like diacetyl, sometimes found in flavored vapes. Tips for Parents & Caregivers: Talk