When you first quit smoking, your body will experience symptoms in the digestive system, circulatory system, respiratory system and nervous system. 1. Digestive system: Digestive and absorption disorders, such as nausea and dry vomiting, acid reflux, heartburn, bloating, abdominal pain, constipation, etc., are all phases of quitting smoking. 2. Circulatory system: cardiac arrhythmia, paroxysmal tachycardia and other symptoms such as palpitations, shortness of breath, chest tightness, precordial discomfort, etc. will occur when quitting smoking. 3. Respiratory system: symptoms such as coughing and choking will occur, and in severe cases, transient dyspnea will occur. 4. Nervous system: when quitting smoking, some people will experience symptoms such as anxiety, irritability, easy to anger, or vegetative nervous system dysfunction when sleeping, which are all normal manifestations when quitting smoking. Note: If the above symptoms do not subside, consult a doctor in time.