Allen Carr says when you extinguish your final cigarette say: "Yipee, I'm a non-smoker!"
By all means do. Absolutely by all means do. It's what I did after the first time I read him and it worked.
This time I'm going to do what he said to himself, it may be more effective for me:
"That was the last cigarette you smoked whether you like it or not."
(Taken from Notebook - Tuesday 18th January - You may get some idea of the reproach I felt two days later having said just that to myself, then buckled... Ne'er mind! I will say it again on Saturday and mean it goddammit!!)