Propylene glycol may be safe to eat, but its toxic to inhale. Inhaling this toxic e cigarette liquid ingredient can lead to lung inflammation and higher risk of respiratory disease. Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link E Liquide menthe glaciale pour e cigarette Meilleur e liquide 2026 Vainqueur du test et recommandations The Dangers of Vaping and Propylene Glycol AJEM