Quitting smoking in patients with mild emphysema can avoid further aggravation of lung tissue damage, reduce bronchial mucus formation, and lower the risk of lung cancer, which can help to improve patients’ symptoms and prolong survival. 1. Smoking is an important cause of emphysema and even chronic obstructive pulmonary disease (COPD). Many toxic and harmful chemicals in cigarettes can damage the bronchial mucosa and alveolar epithelium, destroying the structure of the lung tissues, and thus causing the above diseases. 2. Mild emphysema patients can avoid further aggravation of lung tissue destruction after quitting smoking, effectively slowing down the progress of the disease and avoiding the development of chronic obstructive pulmonary disease or even chronic pulmonary heart disease. 3. Harmful smoke will stimulate the bronchial mucosa to secrete a large amount of mucus, forming phlegm embolism, which not only seriously affects the lung ventilation function, but also easily complicates lung infection. Mild emphysema patients quit smoking can reduce the stimulation of the bronchial mucosa, reduce mucus secretion, the patient coughing, sputum, asthma and other symptoms will improve accordingly. 4. Smoking is a clear factor that can induce lung cancer, especially squamous lung cancer and small cell lung cancer are closely related to smoking. Mild emphysema patients can reduce the risk of lung cancer and prolong the survival period after quitting smoking. Smoking is harmful to health, quitting smoking not only helps to avoid the development of respiratory diseases, but also reduces the risk of cardiovascular and cerebrovascular diseases, urological malignant tumors and other diseases, so it is recommended to reduce smoking or quit smoking as soon as possible.