This landmark book, Grandpa, Will Marijuana Hurt My Brain, 11 Key Ways That Using Marijuana Can Damage The Brain of a Youth, by the noted psychobiologist Dr. David Goodman, is written for younger teen and preteen youth and their parents. Dr. Goodman, whose research on the effects of various drugs upon the brains of youth and adults go back decades, uses a wide variety of quality research in his effort to share the long term damages that using Marijuana before a youth's brain is fully developed. Early in his career he found his passion was sharing key research in a way that it could impact our youth. This is his fifth such book. Although Dr. Goodman passed away in 2015, one of his last wishes was to get this book into the hands of as many youth as possible. We are confident that you will find the information shared to be both educational and enlightening.