Start by making it inconvenient for yourself.
Move your cigs to another room so you have to get up to get them.
Make sure you don't smoke in your house.
Stay away from bars if you're the type who smokes more when you drink. ---Oh...having drunk with you, that might be a difficult one.
Wean off....you can use a timer on your oven....go from one an hour to one every hour and a half.
Start walking and exercising, which will begin cleaning the toxins out.
The only thing we've been able to do to keep our smoking down is not allow smoking in the house. I am hopelessly addicted.