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. Electronic Cigarettes and the Lungs: What you NEED to know E Cigarette Direct Cardiologists establish how e cigarettes damage the brain, blood vessels and lungs EurekAlert! Health effects and known pathology associated with the use of E cigarettes ScienceDirect