Well done. Top stuff (but soon you won't notice the money your saving). I don't know how I EVER managed to afford fags, I wouldn't be able to now.
If you have any form of insurance that may be affected by lifestyle - life insurance, mortgage cover, stuff like that - get in touch with them and let them know you've quit. After a year they come round and test you (you have to remind them, so make a note of when you stopped) and then your premiums go down.
And from now on, keep reminding yourself you are a Non-Smoker. You don't smoke. It's a change in mindest that helps you avoid the odd cheeky one.
And well done (did you see the bit on the telly today where the resting pulse of smokers was 120?!)