Hah!
Not yet any mention of the hours spent sitting in front of the computer while at work! That I would consider the greatest health risk.
Lemme see: working with computer causes lower back pains, upper back pains or stiff upper back, stiff back of the neck, problems with wrists and forearms (actually, this is very much work related, I haven't heard of a gamer who would get this), weakens the blood circulation to legs, delayed sleep schedule due to dis-proportionally bright monitor compared to the environment, tired eyes and all other sorts of eye trouble. And that's just for the starters.
I mean, why isn't this stuff already outlawed?