I have no personal knowledge of Chantix but I know some people on this board have used it and I hope that they show up to share their experiences with you.

Urges are tough and sometimes you think you will never be able to overcome one. But you can - try to distract yourself somehow-do something pleasureable, eat something you love, get lost in a book...
Dwelling on an urge is the worst thing that you can do. Urges do pass and the longer your quit the easier the urges.

Your body not only needs to get rid of the nicotine but also all of the chemicals that the cigarette company put in the cigarette to trap you even more. It is a slow process and the brain has lots of work to do. Give it time to heal and cleanse itself and you won't need to sign your posts "aslave" any longer.

Good Luck
Shelley