I've got that book on my Alibris list. I haven't read it yet.
I'm reading the book I wish I'd read before.....is Beyond the Influence by Katherine Ketcham and W. F. Asbury. copyrighted 2000.
I'm glad I saw a review that noted this book is pretty much the same book as Under the Influence but new brain science has been added. For me the new brain science makes all the difference.
If you are someone who prefers hard science to pop-psychology, then this book will help you tremendously.