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 Is Popcorn Lung Caused By Vaping? 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 Canadian teen develops 'popcorn lung' like vaping illness, unlike U.S. patients Vaping related illness leaves teen with lungs like 'a 70 year old's' CNN Popcorn Lung and Vaping: Debunking the Myths Asia Harm Reduction Alliance