Hon Lik invented the e cigarette to quit smoking but now he's a dual user Vaping The Guardian What is Vaping? Guide Planet of the Vapes E cigarettes: How they work, risks, and research How do E Cigarettes Work? All You Need to Know Pod Salt UK Do e cigarettes kill you? Researchers don't know. Vox E Cigarette Smokers Need More Breaks At Work and Separate 'Vaping' Rooms, Health Watchdog Says Newsweek