I think I read about Kambo once long ago but I didn't remember the name. The article I read, I think in High Times in the '90s, the jungle guy lit a match, blew it out, and used the hot part to burn a spot on the arm of the guy about to take the drug. The drug, I think a sap was applied to the burn wound.

At some point after, the intoxicated guy shit his pants, puked, passed out, etc, but when he awoke, he said his senses were amplified, like he could hear and see better, he would've become a better hunter, one with the forest. He said the tribal people used it as a hunting aid.