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Salvia is an herb that's native to the mountains of southern Mexico. One type, salvia divinorum, has a substance called salvinorin A that can cause intense psychedelic experiences.
Salvinorin A affects structures in the brain called opioid receptors. This makes salvia different from other hallucinogenic drugs like LSD and mushrooms, which affect the brain's levels of a chemical called serotonin.
This guy who took a massive hit is lucky his friends kept him from jumping through a window or doing something else crazy that could get him hurt or killed.