told about? you have never seen traditional healers using psycoactive drugs, not even american indians or natives in the amazon for example?
but for your sake, lets simplify it and keep it closer to home.
The use of psychoactive plants by traditional healers in southern Africa appears to be a neglected area of ethnobotanical research. This article explores the healing dynamics involved in the use of popular psychoactive plant preparations known as ubulawu in the initiation rituals of Southern...
www.ncbi.nlm.nih.gov
yeah well, sometimes if you have a underlying psychotic problem, psychoactive drugs will bring that right to the surface. lots of studies around it. specially since cannabis is legal.