I agree with you Ed Strong Natalie - stick in there. I'm coming up to my 5th anniversary of stopping now and I'm still counting. At first you count in days, then your first week, then month, then year etc.
As Ed says, I feel twenty years younger too. I'm nearly 45 and I used to put all my painful legs, breathlessness etc down to creeping age. Now that I've stopped smoking I can suddenly breathe properly again. My legs no longer keep me awake as what I put down to walking aches must have been bad circulation. I suddenly discovered the world of smell too as I started smoking when I was 9 and I'd completely forgotten. I still remember the shock of smelling blossom and flowers for the first time which occurred about three weeks after I stopped.
Then there is the money. My wife stopped smoking at the same time as me. We now religiously put 100 pounds every week in a separate account as that is what we used to spend on smoking. Then, every three months or so, we have a week's city break somewhere in Europe with the money. It covers our spending money too. Next month we are going to Gibraltar.
That's our reward to ourselves as we would only have smoked the money. Suddenly, we have no worries about bills either. Try putting the money you would have smoked into an account every week Natalie. Its astonishing how it suddenly multiplies and you do wonder where the money is coming from. And treat yourself as your reward. You'll probably be able to buy yourself any clothes you want, buy a car or have a holiday. That will be your reward and it will keep you going.