Okay, here goes...
First - I would take the "You Can" out of the headline, and just go with "Quit Smoking And Achieve Complete Freedom From Nicotine Addiction"
Second - Change subhead to something along the lines of "A
real smoking cessation strategy that
really works!"
Third - You've done a wonderful job of keeping your copy WIIFM oriented, but I think that you should put more emphasis on the fact that this is a plan
you personally tried and succeeded with somewhere in your copy. Perhaps a story intro about your own trouble with cessation.
Fourth - About 2/3 of the way down the page, you have the sentence "I could never quit successfully because I could never make it through the initial withdrawal. " Just my opinion, but this reads rather awkwardly in relation to the rest of the copy. Not to mention the fact that, again, it makes it sound as though you still have not quit.
I'd try to reword it along the lines of "Until I found this real cessation strategy, it was impossible for me to make it past the initial withdrawal symptoms of quitting."
Fifth, and again, this is just my honest opinion - The copy reads to me a bit chaotic; as though it is a lot of random thoughts about the same subject all placed on the same page. That isn't to say that the copy is bad, or anything like that. Only that you may want to consider reworking it so that it flows a bit more smoothly.
Create a section that focuses specifically on the financial benefits of quitting. Another that stresses the health benefits. And so on, and so forth.
The way it currently reads, it is hard to follow each of these points, as they are all just sort of clumped together. Giving each set of benefits its own subsection in the letter, IMHO, will make the entire letter flow better.
I'd also recommend breaking your paragraphs apart a bit more. One or two sentences apiece. Instead of the three and four they are now.
And... last, but not least... you need a stronger call to action at the end.
Okay, you can throw something at me now

Hope that helps a bit