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Manufacturers are able to control the amount of nicotine in their products by altering the pH level of the product

In one laboratory study, the chemicals that leached from a single cigarette butt (soaked for 24 hours in a liter of water) released enough toxins to kill 50 percent of the saltwater and freshwater fish exposed to it for 96 hours

One recent study found that e-cigarette use after quitting smoking may weaken some benefits, including lower lung cancer risk and death

And on social media sites like TikTok, the product is popular among so-called "zynfluencers" who document their use daily, tucking a pouch discreetly into their upper lip before school, work, or gym sessions, in the middle of sports games, while playing video games, and conducting taste-tests with friends