Well I used to be horribly addicted to World of Warcraft when I was in like 7th grade so about 5 years ago or so. Since then there really haven't been any games I'm actually addicted to. I mean Call of Duty 4 has about like 35 days of gameplay on one of my accounts so I guess that one, but in reality I played that so much not just because I really liked it, but because at the time I didn't really have any other multiplayer games, and there weren't any on the market I was interested in. As a result of this I pretty much beat any single players games I had on 2 or 3 difficulties, then went back onto CoD4 because multiplayer=replay value IMO.
I do however occasionally have stints where I'll have a Skyrim craving and I'll get on and play that non stop for a week or two but that usually dies down, so I guess I'd call that a temporary addiction.
But the moral of the story is:
Yes the game is in all honesty extremely fun. But don't get into lol. Trust me.