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'''Poison''' is any substance that causes disturbances or a harmful effect when administered to a living organism.<ref name=toxicology>{{cite book|editor=Hodgson, Ernest|author=Hodgson, Ernest|chapter=1 - Introduction to Toxicology|title=A Textbook of Modern Toxicology|page=3|edition=3rd|publisher=John Wiley & Sons|location=Hoboken, New Jersey|year=2004|isbn=0-471-26508-X}}</ref> The term poison is closely related to the amount as high doses of a substance can be harmful, and at the same time not cause injury in a lower dose.<ref name=toxicology />

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