Canadian teen develops 'popcorn lung' like vaping illness, unlike U.S. patients Vaping: Get the Facts. Protect Your Future Anne Arundel County Health Department E Cigarettes Vaping with Juul & Other Electronic Cigarettes 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 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