Organic arsenic is less toxic than inorganic arsenic, and accounts for most of the arsenic humans are exposed to, primarily through food and water. Inorganic arsenic is a byproduct of smelting metals and was used in the past in chemicals that pressure-treated wood for outdoor use, though this has been phased out in recent years. Inorganic arsenic is present in mainstream tobacco smoke and presumably in sidestream smoke as well.
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