https://thenextweb.com/syndication/2018/11/11/scanning-technology-could-prevent-fake-e-cigarette-liquid/

Over 35m people worldwide now use e-cigarettes, according to one estimate. In the US, this includes 4.5 percent of the adult population.

But the rise in vaping has led to a trade in fake e-liquids – the mix of water, glycerol, propylene glycol, flavors and (usually) nicotine used to create the vapor of e-cigarettes.