A lot of people still think vaping is harmless, but scans like this are a reminder that the lungs don't always recover from the damage. Some e cigarettes contain chemicals like diacetyl, which Radiologic, Pathologic, Clinical, and Physiologic Findings of Electronic Cigarette or Vaping Product Useassociated Lung Injury (EVALI): Evolving Knowledge and Remaining QuestionsRadiology Researchers Reveal How Vaping Causes Brain and Lung Damage 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. PET imaging shows greater lung inflammation in e cigarette users than cigarette smokers