Smoking is harmful to health, cigarette combustion will release acetone, tar, nicotine and carbon monoxide, which will pose a serious threat to the patient’s health. The main material component of tobacco is nicotine, which has strong central neurotoxicity and organ toxicity and is addictive. Sudden cessation of smoking will also have a withdrawal reaction, which is disturbing to the mind. The smoking process generates a large number of toxic chemicals that damage the respiratory tract and cause coughing, as well as for people who smoke secondhand. Tobacco contains substances such as tar nicotine, which is highly carcinogenic, in addition nicotine in cigarettes alters the brain and can increase mood swings and make people more anxious. The tar and nicotine in tobacco can lead to arteriosclerosis, hypertension, coronary heart disease, etc. Long-term smoking may induce emphysema, chronic bronchitis and lung cancer and other diseases. Smoking is harmful to the body in a variety of ways, and it is recommended that smoking should be prohibited from a health perspective.