Instruct: Classify a given review into positive or negative sentiment.
Query: Excellent!

This book is motivating, inspiring, and supportive. After smoking heavily for over twenty years, I managed to quit simply with this one book. It has been four years now without cigarettes, and I occasionally refer back to it for its uplifting thoughts and ideas and am able to apply them to other problem areas. I recommend it highly to anyone who is serious about wanting to quit smoking.