What clinical finding is MOST suggestive of an inhaled poison?

Name: What clinical finding is MOST suggestive of an inhaled poison?
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Black-colored sputum is a clinical finding that suggests an inhaled poison, such as carbon monoxide or smoke inhalation. Altered mental status and tachypnea can also be seen with inhaled poisons, but they can have other causes as well. A swollen tongue may be seen with several different types of poisoning, including ingested poisons or an allergic reaction.

What Clinical Finding Is MOST Suggestive of an Inhaled Poison