👉 Nicotine is a chemical compound found in tobacco plants. It is also present in various other plant species, such as nicotine in nicotine gum and cigarettes. The primary function of nicotine is to act as an兴奋剂，刺激神经系统，增加心率和呼吸频率。它还具有镇静作用，并对中枢神经系统有抑制作用，从而影响睡眠质量和情绪状态。
