What steps can one take to avoid cancer, and could most cancer patients have avoided the disease?

Here are the obvious steps I know of: Don’t smoke, don’t go to gas stations or touch products made by oil companies, don’t drink sodas, don’t drink alcohol, don’t have a job that is in a hazardous environment with cancer causing agents, avoid radiation, a raw foods diet, a diet from untreated animals, taking fish oil, anything else?