Originally published in 2013 ‘Cactus of Mystery: The Shamanic Power of the Peruvian San Pedro Cactus’ is written by Ross Heaven, with additional contributions from David Luke, Eve Bruce, Morgan Maher and others. Heaven is a psychologist, healer and workshop facilitator. He has authored more than ten books, including ‘Plant Spirit Shamanism’ and ‘Shamanic Quest for the Spirit of Salvia.’The mescaline containing cactus San Pedro, Trichocereus pachanoi, has been a very little tackled subject to