I read it several times and smoked thru all readings. I eventually "got it", a conceptual revelation if you will and quit for over 10 years now.
I should add, when I first saw the advertisement at a Barnes & Noble Book Store, it upset me incredibly.
So much so I left the store and returned a couple hours later. I have kicked many drugs prior and smoking "seemed" too formidable. But it does work if you follow it's readings and you truly understand it. Good luck!