I'm addicted too bro. I think it's not about masturbation itself tho, confidence and self image is crucial to beating stuttering and bad habits like masturbation, junk food, etc. are destroying our confidence, because we know we did something wrong, something that we are not proud of, that's why we need to stop doing the bad habits and start doing things that are actually developing as and helping our self image. It's definitely much easier said than done tho, I'm writing all this shit and I still stutter quite a lot, I still do the bad habits even though I know it's bad for me.