I have stopped smoking using this book. It does nothing more than open your eyes to the reality of your problem with nicotine and helps you understand your experiences when trying to stop previously which made it feel so difficult. I NEVER expected I would find it so easy but here I am without a desire to pick up another cig or vape again!
If you are considering buying then do it. Its worth every penny. I also tried the audiobook as I don't always get time to read and it was just as good.