Health experts warn that flavored e cigarettes may lead to permanent lung damage. A U.S. teenager was diagnosed with "popcorn lung" after covertly vaping for three years, resulting in a lifelong, debilitating condition. E cigarette induced changes in cell stress and mitochondrial function ScienceDirect Lung Injury Associated with E Cigarette or Vaping Product Use Pediatric Annals Vaping May Be More Dangerous Than Cigarette Smoking, Studies Show University Hospitals Dangers of Vaping University of Utah Health University of Utah Health