Among the drug categories, which one is primarily an Inhalant?

Nitrous oxide is primarily classified as an inhalant due to its common usage in gaseous form, which is inhaled for effects such as euphoria or sedation. It is often found in whipped cream dispensers and can be used recreationally by inhaling the gas. This method of administration is characteristic of inhalants, as they are typically substances that are rapidly absorbed through the lungs after being inhaled, providing quick effects.

In contrast, cannabis, which can be smoked but is not categorized as an inhalant per se, is primarily known as a marijuana product with a wide range of effects when consumed. Codeine is an opioid that is typically ingested in liquid or pill form rather than inhaled. Ecstasy, also known as MDMA, is usually taken in tablet form and is not associated with inhalation. Thus, nitrous oxide stands out as the clear representative of the inhalant category among the options presented.