For the smokers themselves, the dangers of smoking are manifested in three ways: 1. Cancer Primarily, it induces lung cancer (heavy smokers are 15 to 25 times more at risk than non-smokers). The medical community believes that the main culprit of lung cancer is smoking, and in just 20 years, from the early 1950s to the early 1970s, lung cancer increased by 122% in men and 177% in women. Regarding the causative factors of lung cancer, the relationship between smoking and lung cancer was proposed as early as the 1920s, but it was not until the 1950s that British medical researchers conducted a large-scale survey of 59,000 British doctors and concluded that smoking was the leading cause of lung cancer from an epidemiological point of view. In China, lung cancer is already the number one cancer, with 90% of men and 79% of women having lung cancer related to smoking (10.8 times more likely than non-smokers), and 80% of these lung cancer patients are already in advanced stages when they go to the hospital. 2.Chronic obstructive pulmonary disease This is a common respiratory disease, long-term inhalation of harmful gases, causing abnormal inflammatory response in the lungs, bronchial stenosis and obstruction, as well as reduced lung elastic retraction force, resulting in restricted airflow during exhalation, and can not be fully restored to normal, gradually aggravated. Early symptoms are mainly coughing and sputum production, which worsen in autumn and winter. Later, respiratory function gradually decreases, with chest tightness, shortness of breath and wheezing after activity, and over time it develops into pulmonary heart disease and even respiratory failure. At present, there are about 270 million patients with chronic obstructive pulmonary disease worldwide. After cardiovascular disease and acute respiratory disease, chronic obstructive pulmonary disease is the fourth leading cause of death in the world, together with AIDS. In China, there are about 42 million patients with chronic obstructive pulmonary disease, and 2.5 people die every minute because of this, and the number of deaths is 1 million and the number of disabilities is 5-10 million every year. Chronic obstructive pulmonary disease is the fourth leading cause of death among urban residents in China, and the leading cause of death in rural areas. Unfortunately, the awareness rate of the public about slow lung disease is very low, and patients often consult the doctor only because of serious symptoms, while slow lung disease is already in the middle or late stage. Experts statistics, 80% to 90% of chronic obstructive pulmonary disease is caused by smoking, the mortality rate and the daily amount of smoking is a significant dosage relationship, and with the beginning of smoking age, inhalation depth. 3, coronary heart disease Smoking is the main risk factor for coronary heart disease, because nicotine can significantly accelerate the heart rate and increase blood pressure. Increase the load on the heart, and can damage the walls of blood vessels to thicken and harden, resulting in narrowing and blockage, and eventually coronary artery blockage, coronary heart disease. In addition, smoking may also lead to other diseases including stroke, peripheral vascular disease, atherosclerosis and other cardiovascular diseases (4 times more likely to have cardiac arrest); gastric ulcer, duodenal ulcer disease (30.1% increase in the chance of stomach cancer); can cause low weight, weight loss, accelerated memory loss, increased facial wrinkles, increased infertility, etc.