"A piece of cake" by an author called Cupcake Brown. I read it quite a while ago, but had to mention it. I love biographies, especially ones that tell of triumph over drugs etc. That's what this book is about. The lady telling the story, her mother (who was always high) named her "cupcake" as a child, hence the title and her name. I couldn't put it down!
But a warning-this book is pretty graphic, but well worth the read