I was a really "hard" stutterer for 12 years approximatly. I don't smoke it anymore, but i remember what really helped me : not the cannabis itself, but the guy i was smoking with. I remember at first i apologized all the time when i started to stutter. But he kept saying sincerely "no it's ok, don't apology, it's fine". He never showed any boredom, he was so patient and remained captivated all the time. I never noticed any single facial expression from him linked to my stuttering. It was something like 20 years ago, he was my big stepbrother, and i can say it was such a releif to me, i will never forget it. I wish you all to meet someone like it. I think it is what helped me the most. I started to speak more and more fluently with him. I think he was happy to notice my improvements too. A year later more or less, the new people i met couldn't even notice that i was a stutterer. Rarely, i still happen to block a bit on the words "Bonjour and "Au revoir", i don't know why. But i can say i speak fluently now. Cannabis isn't good for the mind (at least mine) if smoked for a too long time. I'm happy i stopped it when my child was born. I wish you all to meet good people brothers