Originally Posted by halfbiked
My personal theory - of which I admittedly have absolutely no proof - is that sunscreen is a contributor to skin cancer. I'd rather slowly build up a tan than rely on a chemical to protect me. In the event that the sun is too harsh for that strategy, cover up. Wide-brimmed hats (admittedly difficult on a bicycle), long sleeves, etc.
I suggest you are half right. Exposing oneself with sunscreen is better than exposing oneself without, but even better is protecting oneself from the sun. A big problem with sunscreen is that people apply a bit, then consider themselves protected for the entire day and try to toast like a piece of bread. No wonder they start to look like a lobster.