Yes, it is. The story in 'A Million Little Pieces' is based on the author's life. It delves deep into his experiences of being an addict. He describes his days filled with drugs, the chaos it brought to his life, and then his entry into rehab. In rehab, he goes through a transformation, facing his inner demons, and trying to rebuild his life. All these elements are part of what was purported to be his true story.