Chest pain after smoking is not necessarily lung cancer. Lung cancer is a relatively common disease in clinic, which has obvious correlation with smoking, and the common clinical manifestation of lung cancer is coughing up blood. The vague pain caused by coughing is not necessarily a symptom of lung cancer, but may be related to the damage of respiratory mucosa. Since smoking has obvious correlation with lung cancer, it is suggested that patients should go to the hospital for CT examination of lungs to exclude whether there are occupying lesions in the lungs. Of course, it is recommended to quit smoking earlier to reduce the probability of lung cancer. Therefore, the vague pain after smoking is not necessarily a clinical symptom of lung cancer, but because lung cancer is related to smoking, patients should pay attention to the examination on time.