A drug refers to any chemical substance capable of inducing physiological and, if relevant, psychological alterations upon consumption by an organism. This definition typically distinguishes drugs from substances like food that primarily offer nutritional value. Drugs can enter the body through various routes, including inhalation, injection, smoking, ingestion, absorption via skin patches, administration as a suppository, or dissolution under the tongue. In the realm of pharmacology, a drug is a chemical compound, usually with a well-defined structure, that, upon administration to a living organism, triggers a specific biological response.

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