Mo. Rev. Stat. § 579.097

No person shall intentionally smell or inhale the fumes of any solvent, particularly toluol, amyl nitrite, butyl nitrite, cyclohexyl nitrite, ethyl nitrite, pentyl nitrite, and propyl nitrite and their iso-analogues or induce any other person to do so, for the purpose of causing a condition of, or inducing symptoms of, intoxication, elation, euphoria, dizziness, excitement, irrational behavior, exhilaration, paralysis, stupefaction, or dulling of senses or nervous system, or for the purpose of, in any manner, changing, distorting, or disturbing the audio, visual, or mental processes; except that this section shall not apply to the inhalation of any anesthesia for medical or dental purposes.