View of a ClopiNette store in Paris, France on August 23, 2012. ClopiNette stores sell electronic cigarettes, also known as e cigarettes to help the consumers to quit smoking. The electrical device simulates Should I take up e cigarettes in order to stop smoking? Vaping The Guardian Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link The Impact of E Cigarettes and Asthma: What You Need to Know