Is it correct to say that there are cancer cells in every person? Correct. Autopsies of 525 men who died in car accidents in the United States found that one-third of those aged 30 to 39 had cancerous lesions in the prostate, while the figure rose to 70 percent for those aged 70 to 79. If more cancers were found, some kind of cancer cells would be found in everyone. However, cancer cells are not the same as cancer, and they are not the same as malignant tumors. There is a distance between cancer cells and cancer, and between malignancy and malignancy. Most of the cancer cells are removed by our immune system, but if the immune system fails for various reasons, i.e., if we do not pay attention to cancer prevention, this distance will be shortened, and sooner or later we will get cancer, get life-threatening malignant tumors, and die from cancer. If we pay attention to the prevention of cancer, the distance will be prolonged to the extent that we will not get cancer in our lifetime or we will not die from it if we get cancer. Everyone will die sooner or later, and the goal of cancer prevention is not to die from cancer. The relationship between human beings and various chronic diseases including cancer is a race. To live to the end is a victory for human beings, to die of illness is a victory for chronic diseases, and to delay the death of illness even if we cannot live to the end is the right way to health. Therefore, adopting a healthy lifestyle and increasing positive energy for a rainy day is the best way to reduce tumor attacks.1. Quit smokingThe incidence of lung cancer in China is rising rapidly, and the incidence of lung cancer in children is rising rapidly. From tobacco control to smoking ban is the most effective way to prevent lung cancer. Quitting smoking can not only prevent lung cancer, which is a highly malignant cancer, but also prevent lung cancer in your family, friends and relatives, including your children, so why not? In addition to lung cancer, smoking causes other cancers. A lung specialist put it well: you pay twice for cigarettes, once you buy them and the other time they buy your life. Smoking is associated with 22% of cancers, and staying away from cigarettes can at least reduce the likelihood of developing cancer by 10% to 20%. Even for old smokers, the likelihood of lung cancer drops by at least 15% after quitting smoking.2. Active and moderate exercise and controlling your weight can reduce the risk of colon cancer by half, lung cancer by 40% and breast cancer by one-third if you exercise three times a week for 30 minutes each time. The risk of dying from cancer can be reduced by one-third if you do weight-bearing exercises consistently. Exercise can also reduce the recurrence rate of colon cancer by half after surgery. Weight control and exercise are good habits and anti-cancer methods that everyone should adhere to throughout their lives, starting from today, not waiting. 3. People over 50 years old can take low-dose aspirin. But in terms of cancer prevention, it can reduce the incidence of colorectal cancer by 37% after five years of taking it and 74% after 10 years, and reduce the appearance of intestinal polyps by 19% to 35% after three years of taking it. Aspirin can also reduce mortality in colorectal cancer patients by one-third to one-half. In addition to colorectal cancer, aspirin has been shown to have a preventive effect on other tumors. A large study reported by the National Cancer Institute in 2007 found that taking anti-inflammatory drugs even once a year reduced the incidence of stomach cancer by one-third, and the more you took the better the effect. Aspirin is one of the anti-inflammatory drugs. A recent study in Italy found that aspirin reduced the incidence of oral, laryngeal, esophageal, prostate and breast cancers. Stomach and breast cancers are the major cancers in China. Taking aspirin can prevent several cancers at the same time.4. Regular medical checkups can lead to early prevention, early detection and early treatment.5. Healthy dietAccording to available information, high fat intake can lead to breast, colon and prostate cancers, but not liver and cervical cancers. It is important to consume less fat, especially less animal fat, that is, do not eat red meat, eat chicken with less fat content, and drink skimmed milk. You should also pay attention to vegetable fats, because only monounsaturated fatty acids are not related to cancer, and excessive intake of polyunsaturated fatty acids can also cause breast cancer and prostate cancer. Eat less fried food, use less oil in cooking, and avoid excessive fat intake from foods such as pastries. You can reduce the harm of fat if you eat more fiber. In addition to fiber, eating more fruits and vegetables and using olive oil as cooking oil can reduce the possibility of developing digestive tract cancer.