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Nicotine is one of the main chemicals in tobacco. Nicotine is the main reason that smoking and other forms of tobacco are so addictive. Even though most tobacco users know that tobacco is bad for them, they find it hard to quit because of nicotine's effect. Non-tobacco e-cigarettes, hookahs, vaping pens, and Juul devices also have a lot of nicotine in them.
Critical Care Medicine, Pulmonary Disease
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