Witches’ Ointment: the Secret History of Psychedelic Magic

This book covers the history of psychedelic folk magic, all the way back to medieval hallucinogenic drug use. Called veneficium, or poison magic, back in the day, it was used for Divine contact by witches and other practitioners. 
The Witches' Ointment also features formulas and recipes paired with the incantations you need for preparation.