I used to smoke weed like three years i stopped year ago, at the beginning it was great it made me more relaxed i dont remember how my stutter was bad or good but i had a great experience, until the third year everytime i smoked alone or with friends i got very hard anxiety it was hell i couldn't speek at all, i was so silence everyone knew i have a bad high, until i find a "fix" for it, i combined beer with weed and most of the time my stutter and my anxity vanished, after a while it didn't worked. even if i was sober i felt leftover anxity that affect my whole day, until THANKS GOD i stoped smoking and got out of this loop, i started meditating to get back to "normal" state after a few months i was good as new, my advice if you have any anxiety dont use, if not in the first use then the second... At the end it will rise like a devil.