Plenty of artists smoke and drink, which is at least just as dangerous as being overweight. There's just more focus on the weight thing, because it's unusual for an artist not giving a crap about it.
Chris Brown shouldn't be anywhere near a stage D: He doesn't even seem to have a shred of talent in him. And don't get me started on the girls half-kidding about letting him beat them. I had a very turbulent childhood and watched my mom involved in some things like that. Even as a joke, that is just not funny