https://www.theverge.com/2018/7/23/17605290/juul-nicotine-addiction-lawsuits-vaping-electronic-cigarettes

Three lawsuits against e-cigarette start up Juul Labs, uncovered by Wired reporter Nitasha Tiku, allege that Juul’s patented recipe stoked the users’ nicotine addictions. One of the suits was filed in New York by the mother of a teen who started Juuling when he was 15 years old. Now, he can’t stop, the suit alleges, “even though it subjects him to disciplinary measures at home and at school.”

The complaints, filed in the US District Court in Northern California, the San Francisco Superior Court, and US District Court in New York, specifically reference a key ingredient in Juul’s recipe: compounds called nicotine salts. Nicotine salts form in the heat-dried tobacco leaves that are rolled into most cigarettes, and they’re said to be easier to inhale than the free-base form of nicotine found in cigars, pipe tobacco, and many other vapes.