When I first heard about this book I was skeptical to say the least, but after it worked for about ten of my friends, I decided to give it a try. I finished the book on August 23rd 2011 and haven't looked back. I have not had or wanted to have a cigarette in almost 2 months and it feels wonderful! I was smoking a pack a day, sometimes more, for almost 12 years. I never thought I would quit but I did. I let my boyfriend, who was also smoking almost 2 packs a day, borrow it and he too has now quit. My only con was buying it on the kindle app on my iphone made some numbers not come up, they were just blank little boxes, but that is nothing big! Pick it up if you are tired of smoking. What have you got to lose?