Instruct: Classify Amazon reviews into positive or negative sentiment
Query: An old fav

I just finished reading this book for the second time. I read it years ago and recently found it whilst having a "clean-out".I have to say that I felt incredibly uncomfortable the whole way through, however I couldn't stop reading. This book really provokes emotion and is shocking, in that some people actually live their lives as heroin addicts!This book is highly recommended and is undoubtedly one that you wont be able to forget easily.