The answers you have are perfectly reasonable replies - you make no mention of anything you may or may not have used before, so a tooth whitening kit is a start. Ofc you expect us to be mind readers
Dentists will help you too, as will any other tooth whitening kit/toothpaste you find on the shelf but nothing will work permenantly unless you stop smoking, period.
cheers momac ! i will try! maybe i should of said in my question, i gave up the fags ages ago. Also, i have tried every tooth whitening kit out there! its a real shame as i have pure white teeth except for a stain inbetween my front teeth! cheers momac for a great answer! xx