The duration of coughing and spitting after quitting smoking is related to the length of the patient’s smoking, and needs to be analyzed on a case-by-case basis. 1. Smoking time is not long: smoking time is relatively short, the harmful substances in cigarettes for the respiratory mucosa damage is relatively small, after quitting smoking cough sputum time will be greatly shortened, generally within a week to a few months will be significantly improved. 2. Smoking for a long time: for a long history of smoking old smokers, airway epithelial cells and cilia movement damage, bronchial mucosal damage mucus secretion increased, resulting in chronic bronchitis or even chronic obstructive pulmonary disease, this type of patients may exist for a long time cough cough phlegm and other symptoms, and even lifelong cough cough phlegm. After quitting smoking cough sputum duration is different from person to person, affected by a number of factors, and can not be generalized, should be to quit smoking as soon as possible, to avoid inhaling harmful gases, usually need to enhance the physical fitness, prevention of colds, if you feel unwell should be timely medical care.