”Cancer is fiercer than a tiger”, I believe this phrase has been commonly accepted by people. The reason why it is so feared is that it accompanies our life and we do not know whether it will happen to us someday in the future. In order to reduce the incidence of cancer, scientists all over the world have made a lot of efforts, but with little success. In the past 30 years, the incidence and mortality rate of cancer in China have been on a continuous increase. There is still a long way to go in cancer prevention and treatment. The role of prevention in reducing the incidence and mortality of cancer needs no further explanation. Imagine what the cancer incidence rate in China will be like in 30 years. This depends to some extent on the composition of the population at that time. As the age of tumor incidence is getting younger and younger, such as breast cancer, colon cancer and other tumors have become more and more common to develop before the age of 40. Nowadays, teenagers are entering an age stage with high incidence of tumor in 30 years, so the popularization of tumor prevention knowledge education from teenagers nowadays should be given high attention. The earlier children learn how to prevent diseases, the healthier they will be. Perhaps some people do not quite understand the importance of educating about cancer prevention at such an early age. Consider these factors, and you may support my view: smoking, poor diet, and lack of exercise greatly increase a child’s risk of developing tumors as an adult; these bad habits often develop around the age of 13; and without these bad behaviors, about half of all cancers could be prevented. As China’s economy grows, it will be influenced in part by the lifestyles of Western countries. Looking at the diet of children today and noting the growth rate of obese children in China will give us some hints. These may be the basis for the changes in tumor incidence in China in decades. In today’s world of science, how to reduce the risk of cancer in the future and “prevent it before it happens” from lifestyle habits should be the concern of the society. The knowledge and skills needed to develop healthy lifestyle habits are acquired through learning in adolescence. Schools play a key role in health education, while the family environment and community environment also have an important impact. It is much easier to develop healthy habits early in life than to change unhealthy habits in adulthood. In addition to basic education, schools should naturally teach children the knowledge, attitudes, and skills associated with building healthy habits. This will effectively ensure that today’s children grow up healthy and reduce the incidence of cancer and mortality in the future.