Explore how marijuana’s two main active compounds, THC and CBD, affect your brain and body, and what risk factors to watch out for. — In 1970, marijuana was classified as a schedule 1 drug in the United States: the strictest designation possible, meaning it was completely illegal and had no recognized medical uses. Today, marijuana’s therapeutic benefits are widely acknowledged, but a growing recognition for its medical value doesn’t answer the question: is recreational marijuana use bad for your brain? Anees Bahji investigates. Lesson by Anees Bahji, directed by Anton Bogaty.