The document summarizes the effects of marijuana on the human mind and body. It states that marijuana can impair short-term memory, alter time perception, and reduce the ability to concentrate or coordinate movements. It also mentions increased heart rate and risk of heart attack, as well as potential mental addiction and withdrawal symptoms when use is stopped. The document lists some slang terms for marijuana and notes myths about the drug being harmless or less dangerous than cigarettes. It outlines short term effects like impaired movement and long term impacts like respiratory problems. Finally, it mentions some potential medical uses of marijuana.