Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link 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 Vaping might be more dangerous than smoking New York Post Electronic Nicotine Delivery Systems (ENDS) SCIREQ