Emerging medical research continues to examine the respiratory risks associated with flavored e cigarettes, including concerns about bronchiolitis obliteransoften referred to as popcorn lung. The condition involves inflammation and scarring of the Flavor induced inflammation and cytotoxicity in human aortic smooth muscle cells: Potential implications for E cigarette safety ScienceDirect ICYMI: How e cigarettes can break your heart Physicians for a Smoke Free Canada E cigarettes alter inflammatory state of brain, heart, lungs and colon University of California Effects of e cigarette smoking on periodontal health: A scoping review PLOS Global Public Health E cigarette Characteristics, Safety Issues, & Regulation Britannica