Generally after quitting smoking, the patient’s lung changes include regeneration of lung cilia, improvement of lung function, and discharge of toxins from the lungs. Quitters should adjust their mindset and strengthen daily care, etc. Usually after people quit smoking, lung cilia begin to regenerate, thus improving the filtering of impurities and preventing infection. At the same time, the lung tissue begins to repair after quitting smoking, and the color of the lungs can be seen to change from black to light pink in some quitters’ medical checkups. For some people who quit smoking, the circulation in the lungs is restored after quitting smoking, and the function of the lungs is also improved, so the cough and breathlessness caused by smoking can gradually improve or disappear. In addition, after people quit smoking, the nicotine and other harmful substances in cigarettes will not accumulate or irritate the lungs, and can be expelled from the body with the coughing response. At the beginning of quitting smoking, it is easy to have a tobacco withdrawal reaction, and some people may fail to quit smoking as a result. Quitters are advised to adjust their mindset, drink more water, and eat more fresh fruits and vegetables, such as kiwifruit, tomatoes, and fungus. At the same time, appropriate physical exercise will help the lungs to recover.