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Poisoning occurs when an individual ingests, inhales, injects or absorbs (through the skin) a substance that is harmful to human health (i.e. a poison). Poisoning may cause illness, injury or even death. This may occur soon after exposure, or in some cases, long-term exposure can cause the effects of the poison to develop over several years. Poisons range from substances that are always harmful upon exposure, to those that are only harmful in higher concentrations, to those that are only harmful when ingested - as long as they have the potential to cause harm in some way, they are a poison.
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