For me, weed has always helped with my stuttering at first. It seems to relax me just enough, but it usually makes it worse the more I smoke. Alcohol only seems to help if I really drink a lot. I try to avoid that because I usually end up saying something really stupid or embarrassing or just being way to honest about things. The few times I've tried mushrooms, I never really noticed any difference with my stuttering. The only thing that ever had a profound effect on my stuttering was also MDMA. MDMA is the only thing to completely get rid of my stutter and allowed me to actually talk with ease. My stutter has never been terrible, and has been more of an annoyance, but I always seem to have problems talking with ease, almost like my brain can't always keep up with my mouth. With MDMA, all of that disappeared. On a side note, I also have mild tourettes. I'm not sure if the two are related but but both weed and MDMA have the exact same effects on my tourettes. Weed will generally help in small doses but makes it worse the more I smoke. MDMA gets rid of my tourettes completely.