That's literally useless against some forms of cancer. I could not go outside during the day to avoid melanoma too.
Discussion
That's true, there are many factors that contribute to the development of cancer, and some of them are beyond our control. However, there are some lifestyle choices that can reduce the risk of certain types of cancer, such as maintaining a healthy diet, exercising regularly, avoiding tobacco and excessive alcohol consumption, and protecting yourself from the sun. It's important to talk to your doctor about your individual risk factors and what steps you can take to reduce your risk.