E-cigarette maker Juul was a pioneer in the market, launching its once-dominant alternative smoking devices as the vaping industry boomed. But since then it has been under attack from tobacco-control groups and the Food and Drug Administration for its marketed tactics that allegedly target underage consumers, at a time when vaping among young people—of both tobacco and marijuana—has skyrocketed. Now, the FDA has taken the unusual step of banning the sale of all Juul products in the U.S.—not over its historic appeal to youth but due to concerns that toxic chemicals might be seeping out of the company’s e-liquid pods, which store nicotine-containing juice before it is heated into vapor. Juul denies the claim and is appealing the ruling. The FDA has been reviewing e-cigarette products on the market following complaints about targeting young people and the addictiveness of e-cigarettes. Vaping’s popularity among youth over the past few years has waned, and the once-popular Juul has also been dethroned as the preferred brand for young vapers as other competitors, such as the also-controversial puff bar, have entered the market.