The reactions of the various stages of the smoking cessation process are cough, panic, fatigue, dizziness, increased appetite, smooth breathing, peace of mind, etc. The reactions of different periods are different, as follows. 1. Ordeal stage: Due to long-term smoking, all organs of the human body will be dependent on nicotine in cigarettes, so after a week of quitting smoking, the cilia in the lungs will gradually return to normal function to help remove damaged cells in the lungs. When the cilia are active, they are prone to stimulate the respiratory tract, which will lead to the symptoms of coughing. The sudden reduction of nicotine will cause autonomic dysfunction leading to endocrine disorders, which can be manifested in symptoms such as panic, fatigue and dizziness. 2. Intermediate stage: When smoking cessation lasts for a few months or so, it enters the middle stage of smoking cessation, at which time there will be a strong desire to smoke. Smokers should try to stay away from smoking places and cultivate their own hobbies. Part of the population may transfer their power through eating, so it may lead to an increase in the amount of food and drink and a gradual increase in weight. 3. End stage of smoking cessation: When the time of quitting smoking is 1-2 years, it is the end stage of smoking cessation, and the lung function is also slowly recovered, breathing is smooth, the mood is gradually calm, and the mental state is good. After quitting smoking, each person’s physique is different, and the reaction at each stage is also different. Long-term discomfort symptoms are recommended to go to the hospital for relevant examination and treatment according to the doctor’s instructions. However, smoking is harmful to health, it is recommended to quit smoking.