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. Top ventes : ECG, l'e liquide incontournable des bureaux de tabac franais SmokingBox Some e cigarette ingredients are surprisingly more toxic than others E cigarette vapour from base components propylene glycol and vegetable glycerine inhibits the inflammatory response in macrophages and epithelial cells bioRxiv