Depends on how you game, I consider an addiction something that you blow off responsibilities and important commitments for. If you go to work/school and just game with your free time then that's fine, it's no different from ppl who spend time playing sports, exercise, watching TV, or building a model boat, But if your someone who will ignore your crying kid because you wanna finish a quest first, or call out sick from work because you don't wanna miss double xp thursday then ya, you got an addiction.