Not only does nicotine have effect on the development of nerve, respiratory and cardiovascular systems, but has a complex interaction with carcinogenesis.

尼古丁参与影响神经系统、呼吸系统和心血管系统等重要器官的发育，并与癌症的发生有着密切的关系。

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Another reason is the effect of nicotine, the substance found in cigarettes works on people somewhat as drugs do.

另一个原因是尼古丁的影响，发现该物质在卷烟厂的人有些药物做。

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Nicotine actually exerts its effect by mimicking a second neurotransmitter called acetylcholine.

ECONOMIST: Great drug, shame about the delivery system | The

Interest has thus focused on drugs that inhibit the breakdown of acetylcholine, and also on nicotine, which works by mimicking its effect.

ECONOMIST: Cognitive enhancement

And the effect on the brain is different: with nicotine, the more you smoke, the more you want.

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