From ancient India�s tradition of using the hallucinogenic plant Soma to Pata�jali�s early yoga tradition proposing herbs (o�adhi) as a means to enlightenment to 21st century mestizo shamans in Peru offering ayahuasca medicine retreats�the use of mind-altering hallucinogenic substances has played an expansive role in the generation of religious and mystical experience and the subsequent structure of religious praxis. This class focuses on tracing out the religious elements of this history.