Well done Ambrose, realising that tobacco is the most health-destroying product on the planet is a good first step.
While I have never smoked, I have been involved in helping a few folks to quit.

Let me tell you what you already know, when you stop smoking, your pocket will rejoice, your lungs, heart and blood vessels will rejoice, your taste buds will be happy and you will find a new vitality.

As Ugly Bear suggested, a change in diet will also be needed to avoid extra pounds, and an increase in raw fruits and vegetables in the meals will aid the detox process.

If you want to get really radical, I suggest fasting on fresh juices for 3-30 days. This process is very effective in cleansing the body.
More info at http://freedom-you.com/
and as Uncle Ricky said, prayer really helps.

whatever method you choose, I wish you well.