Experts warn that flavored e cigarettes can cause irreversible lung damage, as seen in a U.S. teenager who developed "popcorn lung"a severe and permanent condition called bronchiolitis obliteransafter secretly vaping for three years. 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 Vaping: Safer than cigarettes or a new health crisis? Amazon.com: ALGRA Vaping Effects on Lungs Poster 24" x 36" Laminated Educational Health Chart Anatomy of Alveoli Damage & Respiratory System Classroom, Medical Office, School Wall Chart : Office Products Vaping associated constrictive bronchiolitis ScienceDirect