The after-effects of smoking cessation include dizziness, fatigue, drowsiness, irritability and other manifestations. For patients who have been smoking for a long time, sudden cessation of smoking will lead to withdrawal reaction, which often manifests itself as generalized discomfort, anxiety, thirst, dizziness, headache, and depressed state of mind. However, the withdrawal reaction is temporary, and these symptoms will disappear when the patient succeeds in quitting smoking after going through the withdrawal process. The benefits of quitting smoking are very many, patients can show the improvement of appetite and digestive function, due to the nicotine and tar in tobacco will stimulate the gastrointestinal mucosa, and after quitting smoking, the stimulation symptoms disappear, then the digestive function is enhanced. In addition, quitting smoking can also reduce the incidence of cardiovascular and cerebrovascular diseases and chronic obstructive pulmonary disease. If intolerable discomfort occurs during the process of quitting smoking, it is necessary to seek timely medical treatment.