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The nicotine in cigarette smoke is a highly addictive compound. Nicotine increases the activity of receptors in the brain and increases the levels of several neurotransmitters particularly those which play a part in the reward circuits of the brain which are responsible for feelings of euphoria and relaxation.

The brain of most people becomes used to higher levles of these neurotransmitters and when smokers try to stop smoking they have a fall in the level of these, resulting in feelings of agitation and anxiety. This drives them back to smoking.

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15y ago

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