“Poison” is a very general term for any chemical that causes negative health effects at a reasonably low dose.
Exactly what that effect is varies.
Carbon monoxide blocks oxygen uptake in the blood so you suffocate without realizing it.
Cyanide inhibits the primary energy production pathways in your cells, forcing them to stop functioning.
Heavy metals displace the metals you actually need in your critical enzymes and form non-functional structures that break down processes.
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