Anything that mutates the cell. Many things can cause cancer but some are more likely than others. The object is to play the odds and increase your chance of living. This is similar to lifestyle SDA teach. Cancer prevention 1.
Nothing is healthy about a healthy tan.
Some skin types are more sensitive than others. However, sun is damaging no matter what skin color you have. Radiation exposure 5. Physical activity increases body's autoimmune system 6. Results of smoking 1.