人一旦对吸烟上瘾后便很难戒掉，因为烟草中的尼古丁被广泛视为毒品，它对中枢神经系统起刺激作用。
Once the human becomes addicted after smoking is very then difficult to swear off, because in tobacco's Nicotine widely regards as narcotics, it plays the stimulation to the central nervous system.
与吸烟者一起生活或工作的人会发现戴隐形眼镜不舒服，因为烟具有刺激作用。%。
People living or working with smokers can find it uncomfortable to wear contact lenses because the smoke causes irritation.
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