Liquid E Cigarettes Liquid nicotine used in e cigarettes still a danger to children despite recent Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link Consider the Consequences of Vaping: Do Air Purifiers Help with Vape Smoke? Smart Air e Cigarettes Safety Not Yet Proven CANSA The Cancer Association of South Africa CANSA The Cancer Association of South Africa