guano reply (but hopefully useful to the OP):
I pretty much have, but I'm the kind of person who jinxes easily (or is deluded enough to think so), so I never talked about it because I'm always afraid of falling off the wagon.
Nicotine gum and lozenges, spending less time with a friend who is a smoker, and the winter cold all helped (it's too cold outside to smoke).
End guano.