Emissions from Electronic Cigarettes: Key Parameters Affecting the Release of Harmful Chemicals Environmental Science & Technology E cigarettes and the ob gyn: Key safety information for prenatal counseling Contemporary OB GYN Propylene Glycol & Vegetable Glycerin, 60% PG 40% VG, 1 Quart, Food Grade Walmart.com Knowledge is power. Start talking to your children now about the dangers of vaping. #themoreyouknow Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link The combination of propylene glycol and vegetable glycerin e cigarette aerosols induces airway inflammation and mucus hyperconcentration Scientific Reports