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Drug Effects
A drug is a substance used to treat an illness, relieve a symptom or modify a chemical process in the body for a specific purpose. A drug is a substance, often addictive, which affects the central nervous system.
(from Wiktionary: A multilingual free encyclopedia)
A drug is a substance used to treat an illness, relieve a symptom or modify a chemical process in the body for a specific purpose. A drug is a substance, often addictive, which affects the central nervous system. 