Hey you're doing great!
I've tried laods of times to stop, the best being 9 months. Champix did help to be fair and the side effect I had were weird but vivid dreams.
I now have ciggies, expensive leccy fag and a nicorrette inhalator in an effort to at least cut down.
It comes down to willpower and a real desire to stop which by the sounds of it you have. If you're tempted try and think what you've gone through so far and how bad you'd feel if you did really have one. Maybe a packet of Polo mints would also help. No, not by lighting the end! Have one every time you're really struggling.
Anyways, keep up the good work and as you can see there are plenty of good people on here helping you along the path.