A few weeks ago, without knowing it, we went a few days without a nuk (except at naptime). We decided right then and there that we were done with the nuk. So far, Griff has done very well. We do still have one attached to a little bunny in his crib, if he get's lucky or smart enough to find it, bonus for him!
I miss the nuk when he falls or bonks his head, it was clutch in getting him to calm down faster, but I've noticed that since giving it up, he needs even less calming down....maybe he is learning to self sooth.
And as a bonus, his sweet little mug is no longer hidden behind that silly plastic nuk!