This doesn't seem like much of a revelation to me, but maybe it is to some people. Hard to say. In any case, very few people are going to stop tanning because a friend or family member prints out an article from CNN and waives it in their face.
If it were me, and a friend were trying to dissuade me from tanning, I would really appreciate a compassionate conversation. And maybe a free bottle of self-tanner ;).
Food for thought.