I've been the opposite. I stuttered pretty regularly up until around 9th grade. I suddenly stopped all through high school, then when I started getting fucked up and smoking weed all through senior year and my college years, I found myself stuttering far worse than ever before when I'm sober. I'm 22 now and considering quitting drinking altogether (already quit smoking pot) to see if it returns my speech to where it was in high school. It's giving me a lot of anxiety over graduating soon and interviewing for jobs knowing my stuttering is so bad right now.