Smoking can damage the lungs to varying degrees, causing chronic bronchitis, obstructive emphysema, bronchial asthma, chronic obstructive pulmonary disease, and pulmonary heart disease, and it is also a factor in the development of malignant tumors in the lungs. There are ways to improve lung function and prevent the development of lung diseases. You should quit smoking and go to an environment with good air in your work and life, not to a crowded environment with dirty air and ensure proper humidity and temperature in the room, for example, the room temperature can reach about 24-26℃, and if necessary, you can also put a humidifier in the room. In addition, the diet must be rich and balanced, you can eat more brightly colored vegetables, fruits and lean meat, high-quality protein, such as milk, soy milk, eggs, nuts, these rich, nutritious ingredients can supplement the lung nutrition and can improve the lung gas, and lung moistening, lung cleaning effect. If the lung function test has a decline in lung function when necessary, you can also inhale bronchodilator drugs. Then there is exercise, proper lip reduction breathing, balloon breathing exercises and aerobic training, including jogging, swimming, tai chi, etc., through a combination of measures to improve lung function, can make the lung mucosa damage slowly reduce, until the recovery of the normal state of the lung mucosa.