baking it into a food and then eating it. Let's focus on five drugs marijuana, ecstasy, heroin, mushrooms and LSD. 1. Marijuana Marijuana is a green and brown mix of dried flowers, stems, seeds and leaves from the hemp plant Cannabis sativa. The main active chemical is THC (tretrahydrocannabinol), which moves quickly through the bloodstream to the brain and other organs throughout the body. Marijuana is a mild hallucinogen that can also act as a depressant or a stimulant. Many people think that it's a plant, so it's natural, and natural is always good-right? Think again, because both natural and synthetic versions of marijuana can cause a long-lasting, negative impact on your developing brain. Some movies and music make "stoner" culture seem cool, natural and like it's not a big deal. But if being fit and getting good grades are some of your goals, using marijuana can become a big deal, fast