Smoking is harmful to the lungs, such as causing chronic inflammation of the lungs, affecting the blood vessels in the lungs and causing lung cancer and other diseases. 1. Chronic inflammation of the lungs: when tobacco is burned, hundreds of harmful chemicals can be released, such as tar and benzopyrene, etc. After these substances enter the lungs, they can be used as antigens or allergens, and irritate the airways or lung parenchyma, thus causing chronic inflammation of the lungs. 2. Impact on the blood vessels of the lungs: the harmful chemicals in tobacco can also make the small arteries of the lungs undergo continuous spasm, which can reduce the elasticity of the blood vessels under the long term effect, and cause the hardening of the blood vessels and other phenomena. 3. Lung cancer: Tobacco in the process of combustion, will produce a large amount of tar and amine nitrite and other carcinogenic substances, these carcinogenic substances in the long-term role of lung tissue may lead to lung cancer. Smoking has many other harmful effects on the lungs, it is recommended that smokers quit smoking in time, go to a regular hospital if symptoms occur, consult a professional doctor, cooperate with the doctor to complete the relevant examinations, and avoid blind treatment.