Tough thing to do - but you can do it. I am going to post a link to a quit smoking forum as we do not have one on HealingWell.
http://www.quitsmokingmessageboard.com/
My husband tried going cold turkey once and he had anxiety and a full blown panic attack so he saw his Dr. and start on a medication which decreased the anxiety and got him through the first couple of weeks.
I wish you the best.
Kitt