Smokers report a variety of physical and psychological effects from smoking tobacco. Those new to smoking will experience nausea, dizziness, and rapid heart beat. The negative symptoms will eventually vanish over time, with repeated use, as the body builds a tolerance to the nicotine. Nicotine can act as both a sedative and a stimulant. Pipe and cigar smokers usually experience more of the sedative/relaxation effect while cigarette smokers usually experience more of the stimulant effect.
In many respects, nicotine acts on the nervous system in a similar way to caffeine. Some writings have stated that smoking can also increase mental concentration.
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