It’s hard to say, outside of the fact that the book helps remove the urge to smoke. It’s a matter of quitting smoking and feeling like you’re missing out on smoking, versus not ever missing it whatsoever. It was like magic for the the first time I quit, because I quit a full year before ever know about this book. Every day was a struggle because I still wanted to smoke. This book took that feelings of wanting to smoke away from me, so it’s not difficult to not smoke.