When you get an urge to smoke again, it is important not to entertain this thought and to eliminate it from your mind quickly.
Urges don't last long but they become more painful the more mental attention they are given. Get the thought out of your mind as quickly as possible, don't dwell on any aspect of smoking or how good it would feel.
There is no place for anything like: "maybe I can have just one", "maybe I can have a drag", "it would be nice with my coffee".
Getting the urge out of your mind is the first step in getting the urge out of your system. Eliminate smoking thoughts quickly when they come into your head and soon, you won't have urges at all.