I agree with you in a way.
True that anything in excess is bad for you ... I bet even eating too many apples is bad for you :P ( not shore about this xD)
But its up to the individual and those important to him, so if you really against your friends life style, and you should be, smack some sense into him.
I kind of like this video its quite insightful:
http://www.gametrailers.com/user-movie/my-gaming-resolution/339735
I hope you find my opinion valuable.







