The original Monte Alban Mezcal contains a specimen of the famous worm that inhabits the agave plant. It is actually the larva of one of two moths. There is some mystery surrounding the purpose of this worm and its supposed hallucinogenic properties. One theory is that the worm serves as proof of high alcohol, which is to say that if the worm does not disintegrate in the bottle, the percentage of alcohol in the spirit is high enough to preserve and pickle. We still hear of the occasional psychedelic experience but we are yet to be convinced these are actually related to ingesting the worm. Suffice to say that, if one has reached the bottom of a bottle of Tequila, hallucinations are bound to occur with or without worms. Higher quality mezcals do not generally include worms.