Drugs are nonfood chemicals that alter the way a person thinks, feels, functions, or behaves. This includes everything from prescription medications to illegal chemicals such as heroin to popular and widely available substances such as alcohol, tobacco, and caffeine. A wide variety of laws, regulations, and government agencies exist to control the possession, sale, and use of drugs. Different drugs are held to different standards based on their perceived dangers and usefulness, a fact that sometimes leads to disagreement and controversy. Illegal drugs are those with no currently accepted medical use in the United States, such as heroin, lysergic acid diethylamide (LSD), and marijuana. It is illegal to buy, sell, possess, and use these drugs except for research purposes. They...

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