Which of the following is considered a common inhalant?

Inhalants are substances that produce chemical vapors which can be inhaled to induce psychoactive effects. Glue is a common inhalant because it contains volatile solvents that can lead to a rapid onset of euphoria when inhaled. These substances are frequently misused for their intoxicating effects.

Unlike marijuana and cocaine, which are classified as illicit drugs with different mechanisms of action and effects on the body, inhalants like glue are often household products that can be easily accessed. Alcohol is also not considered an inhalant, as it is primarily ingested as a liquid rather than being inhaled as vapor. Therefore, glue stands out as the correct answer since it is specifically recognized as an inhalant.