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As concerns over vaping continue to grow, researchers and public health officials are investigating the causes of more than 40 deaths and 2,000 illnesses. It’s confusing even for experts. [...] Although e-cigarettes in the U.S. are regulated as tobacco products rather than smoking cessation tools, Juul – the biggest maker of these devices – has marketed its product as a way for smokers to quit tobacco, with its website saying that its products are a “satisfying alternative to cigarettes.” There are other vaping products, however, that are designed more to inhale THC.