Usually, quitting smoking for a week will produce certain changes in the body, including changes in the respiratory tract, digestive tract, nervous system and so on. 1. Changes in the respiratory tract: After quitting smoking, the cilia of the respiratory tract will gradually be repaired and the secretion of mucus will increase, thus helping to prevent the invasion of dust and bacteria. In the process of preventing the invasion of foreign bodies, the body may be stimulated by the reflexive protective mechanism, so after a week of quitting smoking, the body may cough, cough and other symptoms. 2. Changes in the digestive tract: If you smoke for a long time, the human gastrointestinal tract will produce a certain dependence on nicotine content, so one week after quitting smoking, the gastrointestinal tract may be stimulated by changes in the composition of nicotine, and then cause gastrointestinal dysfunction, nausea, bloating, vomiting and other symptoms. 3. Changes in the nervous system: If you smoke for a long time, the nicotine content of the continuous intake of the nervous system will make the nervous system produce a certain degree of dependence, so one week after quitting smoking, the nervous system may be stimulated by the changes in the nicotine content of the body, which in turn causes the nervous system dysfunction, dizziness, headache, anxiety and other symptoms. One week after quitting smoking may also produce other physical changes. If you experience significant discomfort, it is recommended that you consult a doctor in a timely manner and follow the guidance of a medical professional to handle the situation accordingly.