Cactus phsycotropic should never be considered a recreational drug. I have freinds that are part of a native tribe's hiearchy up in northern california, they describe the use of mescaline containing cactus as a "ritual to cleanse the spirit with powerful medicine". Ingesting this stuff causes vomiting along with a state of mind and body that can be "terrifying, unless properly guided." While they use the more commonly known (AND ILLEGAL WITHOUT RELIGIOUS PERMITS I MIGHT ADD) Lophophora williamsii 'Peyote', they both contain mescaline which is what you want to avoid.
So think of it as ancient religious soul medicine that you never, ever want to take. At least not without the proper tribal elders watching you anyway.