Heard a story once, I did.
About one of the cleverest guys who ever lived: degrees from the finest University in Hamilton, NZ. Lovely wife. Lots of friends... he was feted on the Internet as a top wag, a seriously clever and funny guy!

He had it all....

But then a lifetime of hard-drug abuse suddenly kicked in. Overnight, he was about as smart as an unpeeled carrot - a vegetable, in fact.

Well: it is only a story I heard, once....
But it is a sad story, and it continues to make me
think.