I don’t know about cognitive decline but…
I abused alcohol and pot from age 15 to 21, abused as in should have died.
My short term memory is toast and keeps getting worse. Someone can tell me something and if I don’t write it down it just disappears. I can see the look on my wife’s face and I know it must be the 5th time I’m asking her something within a few minutes. She’s very patient.
I would absolutely fail the person woman man camera tv test.
I have no proof as to why but I gotta believe the old saying of killing brain cells has some truth to it.
I also have no idea if it was the booze or pot, neither or both, it’s one of those things I can’t change but would have if I knew.