I know I read a story somewhere online where some guy named Paul Stamets took a large dose of magic mushrooms and he said he literally slapped himself in the face and told himself to stop stuttering and it somehow went away. As to how true that is? Only he knows, but I've looked the guy up and he seems pretty genuine, so I'm conflicted. He doesn't seem like a guy who would lie about that but at the same time it sounds too good to be true. Stuttering has tons of ways to manifest. Some believe it's a neurological problem, for others it's psychological, for some it's a physical injury or defect that causes a stutter. Psychedelics have been proven to form new and unusual connections between neurons in the brain, connections that we normally don't make while sober, so if the source of most stuttering truly is entirely psychological (which I think it is) then shrooms could potentially "rewire" the neurons in the brain that are causing this mental block in speech. Again, I don't think it's entirely impossible for psychedelics to cure stuttering due to its ability to change our brain's wiring, but we just need more evidence. The odds of recreating what happened to Paul Stamets is honestly very low.