New strong evidence that Juul is more toxic to lungs and hearts than earlier e cigs Stanton Glantz blog Health experts are sounding the alarm about a serious condition linked to vaping, known as "popcorn lung" or bronchiolitis obliterans. This irreversible lung disease is caused by harmful chemicals, like diacetyl, found Not just water vapor: why e cigarettes are so dangerous PUBLIC HEALTH INSIDER Yes, vaping is toxic. A U.S. teen developed "popcorn lung" after secretly vaping for three years a permanent, life altering disease. Officially known as bronchiolitis obliterans, the condition scars the lungs' tiniest Popcorn Lung: A Dangerous Risk of Flavored E Cigarettes American Lung Association