It is possible that not spitting black sputum for 5 months after quitting smoking is normal, because some people have black sputum for a long time after quitting smoking. Whether or not there is black sputum after quitting smoking is related to the individual’s physical condition, the length of time of smoking, and the degree of lung tissue damage. If an individual is in good physical condition, has smoked for a short period of time, and the cilia of the respiratory tract have not been completely destroyed, black sputum may be spat out within a short period of time after quitting smoking. However, due to the relatively short period of time of smoking, the smoking is relatively light, and the inhalation of harmful substances itself is very limited, therefore, after a period of time, the black sputum may no longer be discharged. However, if the smoking age time is too long, cilia inversion, lung phlegm function is reduced, to restore normal cilia function, it takes time will be very long, so attached to the lungs of the black smoke tar-like substances is difficult to discharge out of the body, and even time will be more than 5 months. If obvious discomfort occurs, it is recommended to go to the hospital in time for early and regular treatment.