Have that exact experience when drunk. Unfortunately not while high, I usually have panic attacks and/or ocd level intrusive thought patterns on marijuana. When drunk I am a social butterfly, can speak with no blocks for hours on end. The bad part about that is I was an alcoholic for 3 or 4 years, luckily I’ve cleaned up my act as of recently but it really sucked that alcohol is the only social lubricant I’ve ever found that got rid of my stutter.