I had a teacher that told us that the very slight tingling sensations on your skin that you get after tanning are strands of your DNA breaking in mass numbers so the damaged DNA will be destroyed and not be copied. I still have no idea if thats true
Yeah, scary stuff, cancer is a mutation that prevents a cell from leaving the cell cycle so it just keep duplicating and ends up rapidly growing (depending on the cancer). The sun increases your chances of mutation so PROTECT. YO SKIN.
Take care of your own ass and wear some sunscreen