If a person often smokes, tobacco dependence can be formed, long-term smoking is not good for health, can cause respiratory disease. If tobacco dependence is formed, sudden withdrawal or avoidance of smoking can cause a series of psychophysiological discomfort reactions, also known as withdrawal reactions or withdrawal symptoms. The psychological symptoms of discomfort are anxiety, anxiety, restlessness, and even emotional instability, easily provoked, and in some cases, depression. The physiological symptoms are insomnia, palpitations, sweating and other symptoms of plant nervous disorders.