Yes, vaping is toxic and the consequences can be permanent. A U.S. teenager developed popcorn lung a life altering, incurable condition after secretly vaping flavored e cigarettes for 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. Does vaping cause lung cancer? UT MD Anderson BREAKING: New research suggests flavored e cigarettes may be linked to lasting lung injury. Scientists examined how certain flavoring chemicals affect airway cells. Some compounds were associated with inflammation and impaired repair. The