I pretty much concur with the reviews of the previous 451 people (well, most of them anyway). Believe what you like.
I was told to buy this book by someone who quit 4 years ago. He was a 40-a-day smoker himself and just quit overnight using the book. When he said that he didn't ever fancy a cigarette, I was very sceptical - I know how hard my Father has found it and he quit nearly 30 years ago.
I'm not even sure I really wanted to give up - I think it was more peer pressure than anything - none of my friends smoke and my best friend is married to a Doctor! I got nearly all the way to the end (to the part where you are asked to smoke a final cigarette). I realised for possibly the first time in my life that the most revolting thing I had ever put in my mouth was a cigarette (I was a little boy once too!)
If you've read this far, you're definitely interested. As someone earlier has said, this is half of the battle. This book will help you win the final battle and the war!
I'm not pretending it will help everyone but for the cost of it, even if you quit for a day, you're getting to the point of saving the cost of the book.
As for the person who said that they didn't like the way Allen Carr talks down to them, they obviously live in a little bubble where everyone is nice and polite. Sometimes, to achieve things, we all need to be put in our place. This is something that Allen Carr does correctly. He doesn't do it "just because he can", he does it because he needs you to understand how to help yourself!
20 a day for 22 years to nothing! In just a few hours!
It might be sunny now when you go down the pub and smoke outside... just think about what it'll be like at -10 and you're shivering in the snow!