The way I did it was to avoid situations where I would be offered a cigarette, for example the pub. But what I found was that after a few months of not smoking, I accepted the offer of a cigarette and found that when I took that first draw, I found it repulsive and immediately put the cigarette out. I was a little annoyed for accepting the cig but at the same time was so glad to find that having once yearned for them, I could not stand them anymore.
I know that the cravings can make you feel bad at times, but think how good you WILL feel when you can say that you HAVE given up!
Best of luck.