Lung pain after smoking may be due to the irritating gases contained in the smoke, which stimulate the mucous membranes to produce an inflammatory response, or irritate the intercostal nerves or cause lung disease by smoking. Generally speaking, clinically speaking, the nicotine and tar contained in cigarettes can produce many irritating and harmful gases after combustion, which stimulate the mucous membranes of the airways such as the larynx, trachea, and bronchial tubes, causing inflammatory reactions and irreversible damages after stimulation. Long-term stimulation of harmful gases irritates the intercostal nerves, which causes a painful sensation and makes the patient feel the symptoms of hidden pain in the lungs. Long-term smoking can also cause a variety of serious lung diseases, which can cause lung pain. And long-term smoking can cause cancer in serious cases. When such symptoms occur, you should go to the hospital in time to find out your condition, and quit smoking as soon as possible to avoid adverse consequences.