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In tobacco smoke, nicotine "rides" on small particles of tar. When the smoke with this nicotine/tar mixture gets to the lungs. the nicotine is absorbed quickly - nicotine reaches the brain about eight seconds after the smoke is inhaled. American cigarettes contain about 9 mg of nicotine, but because much of the nicotine is burned off, a smoker gets about 1 mg of nicotine in every cigarette.
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