Sources: Data used to create this ranking were collected as of December 17, 2025 from the U.S
Nutritional additives per KG: vitamin A 19,000 IU, vitamin D3 1,400 IU, vitamin E (alpha-tocopherols) 400 mg, choline chloride 600 mg, zinc 80 mg, iron 72 mg, manganese 38 mg, iodine 0.7 mg, copper 15 mg, selenium 0, 26 mg
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Researchers point out that e-cigarette users inhale nicotine in a vapor rather than smoke and claim that, because e-cigarettes do not burn tobacco, they do not expose users to the same levels of chemicals that can cause diseases in people who smoke conventional cigarettes. While the review gleaned insights into potential short-term safety effects, more data on long-term effects is needed, said Hartmann-Boyce
Smokers inhale roughly two to three times more tar and nicotine than they would if they smoked regular cigarettes
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