humans and a lot of other species need for survival) to enter the lungs, from where it can be absorbed into the bloodstream.

Other substances - accidental

Examples of accidental inhalation includes inhalation of water (e.g. in drowning), smoke, food, vomitus and less common foreign substances (e.g. tooth fragments, coins, batteries, small toy parts, needles).

Other substances - deliberate

Recreational use

Nitrous oxide ("laughing gas") has been used recreationally since 1899

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