The ones on TV? No, probably not, but I don’t doubt that there are some people who truly believe they can because mental illness enables you to believe a lot of odd things
My extremely religious cousin claimed that a faith healer fixed his one leg that was/is shorter than the other. Apparently he “felt” it growing, he said it got warm. Amazing what the placebo effect can do.
Some yes, most no.
There is something to be said for positive thoughts affecting pain management and healing. But thats not going to cure you. You can’t wish a tumour away…or as some people think will cure my depression..think happy thoughts, Wow! have you told the american medical associations this! They would be thrilled to know you found a cure! yeah positive thinking could help in some ways..the mind is an amazing thing…but sadly you can’t just wish yourself better.
Maybe some do, some don’t, but who cares? They can’t!