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A poison is any substance that is harmful to your body. A poison is any substance that, when ingested, inhaled, absorbed, applied to skin, or produced within the body in relatively small amounts, injures the body by its chemical action. The branch of medicine that deals with the detection and treatment of poisons is known as toxicology.
Poisoning represents the harmful effects on the human body of accidental or intentional exposure to toxic amounts of any substance.