Smoking lungs have a reduced function and a higher risk of diseases and cancers compared to healthy lungs, and it is recommended to quit smoking to maintain good health. The chemicals in cigarette smoke damage normal lung tissue, affecting the ventilation and air exchange function of the lungs, and stimulate the tracheobronchial glands to secrete large quantities of phlegm and cough. In addition, the chemicals in cigarette smoke will also reduce the immune function, making smokers more susceptible to pathogenic bacterial infections, and when the chemicals in cigarette smoke cause genetic mutations, serious diseases such as cancer will occur. Therefore, the lungs of smokers do not have any benefits compared to the lungs of healthy people, smoking is harmful to your health and it is advisable to quit smoking to maintain a healthy lungs.