I’ve tripped a lot over the years. LSD, mushrooms, mescaline, ketamine. I still do sublingual ketamine periodically in a quiet setting and reflective manner. To me it’s like a very deep meditation. I feel like I have had The Buddha’s revelation experience. I was Buddha. Got it and saw that everything is as it should be. There is no up without down. I still stutter. Mild to moderate my whole life. Often closeted. Bad psychological damage but much of that amplified by poor childhood and questionable genetics. The tripping helped put some things into perspective, but never solved the stutter for me. I think it’s varies very much by individual. I’m in my 60’s so maybe the muscle memory is too ingrained.