Question: are all san pedro cactus hallucinogenic?
Answer: San Pedro (Echinopsis pachanoi) is a cactus native to the Andean slopes of Ecuador and Peru. It is the South American cousin to peyote, and most notably contains the psychoactive alkaloid known as mescaline. ... In recent years, there has seen an explosion of interest in Ayahuasca and, to a lesser extent, San Pedro.