How long-term smoking can prevent lung cancer

　　Lung cancer is the most common primary malignant lung tumor. According to statistics, 87% of deaths from lung cancer are caused by smoking, including passive smoking. male The mortality rate from lung cancer in smokers is 8-20 times that of non-smokers. There is a dose-effect relationship between smoking and the occurrence of lung cancer. The number of cigarettes smoked per day multiplied by the smoking years is called the "smoking index of lung cancer". If the smoking index is greater than 400, it is a high-risk group for lung cancer. The mechanism of lung cancer caused by smoking has been clearly studied. Epidemiological data and a large number of animal experiments have fully proved that smoking is the main factor causing lung cancer.

　　According to the "2010 China Tobacco Control Report", more than 1 million people die from tobacco-related deaths in my country every year. disease . Data provided by tobacco control experts at the Chinese Center for Disease Control and Prevention show that the number of victims of second-hand smoke in my country has increased by 200 million in the past three years. The report "Smoking Control and China's Future" predicts that by 2030, the annual deaths attributable to smoking in China will reach 3 million, accounting for 25%. "This is a very scary number, and AIDS It only accounts for 2% or 3% of deaths." The mechanism of lung cancer caused by smoking has been clearly studied. Epidemiological data and a large number of animal experiments have fully proved that smoking is the main factor causing lung cancer.

　　Lung cancer does not have any special symptoms in its early stages. They are just symptoms common to general respiratory diseases, such as cough , phlegm and blood, low-grade fever, chest pain, shortness of breath, etc., are easily ignored. In the late stage of lung cancer, metastasis can occur in various organs, causing great pain to patients and threatening life.