Doctors show how vaping THC damages lungs, as illnesses rise nationwide E cigarettes cause lung condition known as EVALI : Revista Pesquisa Fapesp Vaping cannabis found to expose lung cells to toxic and cancer linked substances 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.