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Smoking dry herb produces tar, carcinogens, and other harmful byproducts that can adversely affect lung health

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The researchers admit that their calculation is crude as it relies on averages, assumes the health effects of smoking are evenly spread throughout a smoker's lifetime and they are using that the number of cigarettes smoked throughout a lifetime is constant

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The main ingredients are vegetable glycerine and propylene glycol, but most e-liquids also contain nicotine, which must be no more than 2% or 20mg per ml, as well as small amounts of flavourings and sweeteners