Inhaled substances (street name: “poppers”), including amyl, butyl, and isobutyl nitrite, that produce an intoxication characterized by a feeling of fullness in the head, mild euphoria, a change in the perception of time, relaxation of smooth muscles, and possibly an increase in sexual feelings. The nitrites may produce psychological dependence and may impair immune functioning, irritate the respiratory system, and induce a toxic reaction involving vomiting, severe headache, and dizziness.