Smoking cough may be a precursor of lung cancer. Prolonged smoking can cause cough and increase the incidence of lung cancer. Patients with smoking and coughing need to do lung imaging examination and histopathological biopsy if necessary, and cannot rely on cough alone to determine whether they have lung cancer. It should be noted that there are no obvious symptoms in the early stage of lung cancer, and with the development of the disease, symptoms such as cough, chest pain, chest tightness, dyspnea, emaciation and fever may appear. Smoking cough may also be caused by harmful substances in cigarettes that stimulate the airways. In addition, chronic bronchitis and chronic pharyngitis can also be caused by smoking, so patients need to actively consult the doctor and quit smoking to avoid aggravating the condition.