Nicotine is a neurotoxin that mainly attacks the human nervous system, so smoking addiction is also called nicotine addiction disorder or nicotine dependence. Tobacco addiction is mainly manifested as dependence on tobacco, withdrawal symptoms when you stop smoking, and abnormal behavioral habits.1. Dependence on tobacco: the desire to smoke is greater, the craving for tobacco is strong, you will involuntarily want to smoke, and it is difficult to control this behavior by yourself. When the symptoms of tobacco tolerance appear, the need to increase the amount of smoking to get a more satisfying feeling, resulting in an incremental increase in the number of cigarettes smoked daily, from a few when you first learn to smoke to a box of cigarettes a day, or more than two boxes, or even uninterrupted smoking. Knowing the harm of smoking, but insist on smoking, can not quit; 2, appear withdrawal symptoms: after stop smoking or reduce the amount of smoking will appear withdrawal symptoms, such as dozing, yawning, tears, mood depression, diarrhea, vomiting, fidgeting and other behaviors; 3, abnormal behavior habits: reduce or give up other daily activities and hobbies, do things become rash, emotional control becomes poor, easily excited, impulsive The patient may lose his temper, or become heavy in taste, especially like strong tea, wine, coffee and other drinks with a more stimulating taste. Patients who are addicted to smoking should be aware of the problem and make appropriate improvements in a timely manner. They can reduce their dependence on nicotine by developing rich hobbies, eating a balanced diet, and getting enough rest and sleep.