Kratom

Kratom has been traditionally used for its psychoactive properties in Thailand and Malaysia. In Southeast Asia the fresh leaves are commonly chewed, often continuously, by workers or manual laborers seeking a numbing, stimulating effect. Less commonly, the leaves are decocted or extracted into water and then evaporated into a tar that can be swallowed. Kratom is not often smoked due to the active alkaloids being destroyed by the heat.