Nicotine is one of the main
ingredients in tobacco. Nicotine is a powerful drug that speeds up the brain
and central nervous system. It triggers the release of a chemical in your brain
(dopamine) that boosts your mood, makes you feel calm, and at the same time,
can make you feel more alert.
The nicotine in cigarette smoke is absorbed
through the skin lining of the mouth and the nose. The nicotine level in your
blood peaks within 10 seconds of inhaling (breathing in) cigarette smoke into
your lungs.
Over time, your brain adjusts to
the stimulation from nicotine and lowers your natural energy level or mood. You
may then start to crave a cigarette for a boost. The more you smoke the more
nicotine you need to feel good. Soon, your body craves nicotine to feel
"normal."
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