In the process of smoking tobacco will release a lot of harmful substances, will also produce a lot of black smoke, will enter the bronchi and lungs through the respiratory tract, deposited in the lungs especially in the burning will release tar, the color will be black will be deposited in the lungs, harmful substances will stimulate the local mucosa, produce excessive secretions, through the movement of cilia to discharge the body, but not completely discharged in a short period of time, there may It may be discharged after two months. If there is coughing, coughing and fever at this time, it is also necessary to consider that it is caused by infection of respiratory tract with viruses, bacteria and other pathogenic microorganisms, which will also discharge black pus sputum, and it is necessary to actively treat it with antibacterial and antiviral drugs, as well as drugs to stop coughing and resolve sputum.