Nicotine is an addictive substance, long-term smoking tobacco in nicotine, causing the body’s long-term dependence on cigarettes become addicted to smoking. Some smokers subjectively feel that smoking can relieve fatigue, invigorate the spirit and other neuroleptic excitement, but in fact it is the euphoria caused by nicotine, the nervous system after the excitement then inhibited, the sensitivity and accuracy of neuromuscular responses after smoking are reduced. If you suddenly stop smoking or reduce the number of cigarettes, you will have at least the following uncomfortable symptoms within 24 hours, such as the desire to smoke, irritability, depression, difficulty concentrating, restlessness, headache, drowsiness, intestinal dysfunction, which is a manifestation of smoking addiction. Smoking can have numerous adverse effects on health, so quitting is imperative. For smokers who are not addicted or have a low level of tobacco dependence, they can quit with perseverance; for patients with a high level of tobacco dependence, they often need to be given stronger interventions to quit smoking in order to eventually quit successfully.