Chest tightness and shortness of breath after quitting smoking usually lasts for about 1 to 2 months, which is related to the duration of the original smoking and physical condition. Shortness of breath after quitting smoking is part of the withdrawal syndrome. If you have not smoked a lot or for a long time, the degree of withdrawal syndrome is usually not serious and the recovery time will be about 1 month. In the case of heavy or prolonged smoking, the recovery time may be around 2 months or even longer, and in those who already have chronic obstructive pulmonary disease (COPD), the chest tightness and shortness of breath after quitting smoking may not necessarily be reduced or disappear. In addition, smoking cessation syndrome means that after quitting smoking, in addition to chest tightness and shortness of breath, there will be dizziness, headache, fatigue, drowsiness, yawning, tearfulness, etc. The specific recovery time varies from person to person, and further validation is needed for continued observation. If you can not easily overcome, you can go to the smoking cessation clinic and quit smoking under the guidance of a physician. If you do not recover for a long time, you need to consult a doctor in time to rule out other diseases.