A poison is any substance that, when ingested, inhaled, or absorbed into the body, can cause harm by disrupting normal biological functions. A toxin, on the other hand, is a type of poison that is produced by living organisms (such as bacteria, plants, or animals) and has harmful effects when introduced into the body. In short, all toxins are poisons, but not all poisons are toxins. The key difference is that toxins are specifically biological in origin, whereas poisons can come from any source, whether natural or synthetic.
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