As a teen and young adult, I tanned, never planned to burn, but did many times anyway. Don't we all "tan" as teens to build up a "tan"? Now, as an adult, I have had many cancerous spots removed due to my "tanning". So yes, I believe wholeheartedly in sunblock and I am surprised how many people dismiss the concerns to their children. Maybe if you don't know anyone with skin cancer, it doesn't seem real. I just have to look at my scars to know too much sun is very dangerous. I also don't believe building up a tan prevents cancer since you only have to look at a person who has tanned for years to see the damage in their skin. I wish my mom had known more about sun block and helped me prevent the fear that I live with now of melamona re-occuring.