Dr. Siegel reviews the full spectrum of marijuana’s benefits and risks and debunks myths surrounding cannabis and explores the promises and risks of its many therapeutic possibilities. She thoughtfully investigates the potential downsides of cannabis, particularly with regards to brain health referencing The Amen Clinics’ brain SPECT imaging studies. Siegel opens each chapter with an overview of contradictory marijuana myths (i.e., “The Myth of Harmlessness: Teens won’t be adversely affected by marijuana use / The Myth of Harmfulness: My teen will be irreparably harmed by marijuana use in the short-term and the long-term”), and concludes with her observations as a doctor, as well a conclusion of “What We Know for Sure.”