My short term is bad as well.
So is my creativity and imagination.
I use to be a great artist before I became hardcore on the drugs.
Now I can hardly draw a circle. No lie.
I will hear someone talking to me and as soon as they stop talking I forgot what they said.
Or they will be talking to me and I like zone out and block it for some reason.
I was clean for a little while and it seemed like it got a little better.
Scientificaly I have no idea.
But in experience I believe with time some can come back.