FILE – In this Feb. 20, 2014, file photo, a patron exhales vapor from an e-cigarette at a store in New York. Only two years ago e-cigarettes were viewed as holding great potential for public health: offering a way to wean smokers off traditional cigarettes. But now Juul and other vaping companies face an escalating backlash that threatens to sweep their products off the market. (AP Photo/Frank Franklin II, File)