Never tried mushrooms, but I've taken LSD many times. I don't think it affected my stutter in any way, but it definitely changed my attitude towards it. Nowadays I don't even care that I stutter anymore and even view it as a positive aspect which makes me unique. I don't think I gained confidence or anything but more like I just idgaf anymore about my stutter lol. Having a good support system from friends and family also helps a lot, though.