Here are a few things that have helped me in my battle with Nicotine.
There is a lot of help out there from the NHS etc, but I feel everyone who wants to stop should read Allan Carr's very good book 'The easy way to stop smoking'.
To start with here is a run down of what happens to your body after you stop smoking, it's a sort of check list as time goes by and helps keep you on track :-
I found it helpful to print it out and leave copies where I could easily see them, by the computer, fridge etc......
Within 20 minutes - Blood pressure and pulse rate start to return to norm