Insufflation is the practice of inhaling (or exhaling) of substances into a body cavity.

Medical uses

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Inert, nontoxic gases (such as carbon dioxide) are often insufflated into a body cavity, in order to expand the cavity and increase workroom, or reduce obstruction during investigative surgery.

Drug insufflation

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Psychoactive substances are often inhaled nasally for the purpose of intranasal absorption through the mucous membrane, which is often more rapid, or more complete, than gastrointestinal absorption. This practice is commonly referred to as "snorting" or "snuffing."