Tobacco is a plant. The leaves are processed in different ways to make cigarettes, cigars and smokeless tobacco. Nicotine is the substance in tobacco that causes addiction. It is a stimulant that will cause you to temporarily feel good or energized.
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Nicotine has been found to be as addictive as cocaine, making it very difficult to quit after starting. Chewing tobacco and cigars (even if smoke is not inhaled) are just as addictive because the nicotine is absorbed through the linings of the mouth.