This reads as bait to me. You can see multiple peoples testimonies in the replies confirming that psychedelics succeeded in helping them or those they personally know, where repeated conventional therapy failed them. The long term repairing improvement of a persons mental and spiritual well-being also counts as 'healing' to me as well as many other people.

In the off chance you are genuinely interested in the 'helps fight disease such as cancer' claim, here is a ted talk by a professional mycologist. Its about mushrooms improving the human immune system. At the end he shares the very personal story of his elderly mother developing stage 4 breast cancer basically being told she was too old for conventional treatments and was done for. Only for her to make a full recovery after taking a few medications along with turkey tail mushrooms. You can skip to 9:00 to hear the story.

Fantastic Fungi is a good documentary on netflix if you would like to learn more, very well made and accessible to the common person IMO

Thats all I have to say. I hope you are open minded and learn something new if you decide to check out the ted talk and documentary. If you think its all snake oil BS anyways there probably isn't much I can say to sway your opinion. Hope you have a good one.