First, the harmful components of cigarette smoke cigarette smoke is a complex mixture of more than 4,000 compounds, consisting of volatiles present in the gas phase and semi-volatiles and non-volatiles present in the particles, of which gases account for 95%, such as nitrogen, oxygen, carbon monoxide, carbon dioxide and hydrogen cyanide, volatile nitrosamines, hydrocarbons, ammonia, volatile sulfides, nitrile, phenols, aldehydes, etc.. The other 5% are particulate matter, such as tobacco tar, nicotine (nicotine), etc. Among these compounds, nicotine is the substance that causes addiction, and tobacco tar, carbon monoxide, hydrocyanic acid, ammonia and aromatic compounds are the main toxic substances, of which at least 69 are known carcinogens. About 30 percent of all cancer deaths can be attributed to the use of tobacco products. Second, the relationship between smoking and disease In 1998, Professors Liu Boqi, Niu Shiru, and Yang Gonghuan organized and led a retrospective survey of 1 million deaths and a follow-up survey of 250,000 people in China, respectively. Both surveys showed that chronic obstructive pulmonary disease (COPD) accounted for 45% of smoking deaths, lung cancer accounted for 15%, and esophageal cancer, stomach cancer, liver cancer, stroke, coronary heart disease (CHD) and tuberculosis each accounted for 5%-8%. Smoking is a risk factor for many diseases, and tobacco can damage almost all organs of the body, such as the cardiovascular, respiratory, reproductive, endocrine, and skin systems. Diseases and lesions associated with smoking include hypertension, CHD, stroke, peptic ulcer, cancer (lung, lip, mouth, nose, throat, larynx, esophagus, stomach, liver, kidney, bladder, pancreas, and cervix), COPD, asthma, thromboembolic vasculitis, impotence, aortic aneurysm, peripheral vascular disease, agranulocytic leukemia, pneumonia, cataract, Crohn’s disease, hip fracture, and periodontal disease. The greater the amount smoked, the longer the duration of smoking and the earlier the age at which smoking begins, the greater the risk of smoking-related disease and death. Because the health damage caused by smoking is characterized by a long-term lag, with diseases associated with smoking appearing only after 10, 20 or even more years of smoking, the dangers of smoking are often not recognized until the disease appears.