Pretty bad, but in a I've used it so much it just comes out in casual conversation, not so much that I stay angry all the time. It is pretty bad, though.
I used to swear like a Sailor (every sentence basically), but now it's only when something really bad happens.
I only curse as a substitute for some other word if it fits better in a joke I'm making. Or if I'm really angry. But that only happens about once a year or so