There’s a massive amount of anecdotal evidence and formal evidence to suggest this is true. Where have you done your research? As I’ve been saying, stuttering occurs bc a variety of factors. I differentiate between “brief initial repetitions” and “hard/long blocks”. Everyone starts w type 1 and then progresses *toward* type 2 as they become aware of a need to “try harder to prevent the problem”. It’s a snowball effect. Every factor intensifies other factors. Which came first- chicken or egg? Both, and they both keep exacerbating each other. I never said it does not help to know what causes it - just that it serves no purpose to narrow down causal factors *exactly*. I just interviewed for a teaching position in a highly respected school district. I started by telling them I stutter, and my 2nd interview included 30 mins leading an interactive lesson in front of 20 students and 9 staff. I was offered the job 10 minutes later pending contact w my references. in December I had medical procedure and while in recovery room, I was unable to call out for nurse for 2 hrs (she forgot to give me call button). She overheard me crying to my parents “I cannot talk to my nurse” and nurse got super cold to me. I also literally had my resignation letter (at job I just left) written bc my blocks were so bad. I did 4 things after December - disclose, make/hold eye contact before starting to talk, relax stomach muscles, and start talking slowly/enunciating. It costs nothing to try, esp if you do it at a random store you’ll never go to again. But maybe it’s not worth it to you to try?