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 Health Risks of E Cigarettes and Vaping American Lung Association Does Diacetyl in Vaping Cause Popcorn Lung? Clutch Vape Vape Mythbusting: Debunking 7 Common Myths Canadian teen develops 'popcorn lung' like vaping illness, unlike U.S. patients