having known dozens of friends, family, roommates, coworkers etc both before and after they started them. The two biggest telltale signs -

1. tendency to produce - out of no necessity whatsoever, mind - walls of text. walls of speech will happen too but not everyone rambles.

2. Obnoxiously confident that they're fundamentally correct about whatever position they happen to be holding during a conversation with you. No matter how subjective or inconsequential. Even if they end up changing it an hour later. Challenging them on it gets you more of #1.

Pretty much spot on! It is frustrating to talk with these when they never admit they are wrong. They find new levels of abstractions to deal with your simpler counterarguments and it is a never ending deal unless you admit they were right.

Many people like to write in order to develop and explore their understanding of a topic. Writing lets you spend a lot of time playing around with whatever idea you're trying to understand, and sharing this writing invites others to challenge your assumptions.

When you're uncertain about a topic, you can explore it by writing a lot about said topic. Ideally, when you've finished exploring and studying a topic, you should be able to write a much more condensed / synthesized version.

I mean, I know the effects of adderall/ritalin and it's plausible, what I'm asking is whether if gp knows that for a fact or deduces from what is known.

I call this “diarrhea of the mind”. It’s what happens when you hear a steady stream of bullshit from someone’s mouth. It definitely tracks with substance abuse of “uppers”, aka meth, blow, hell even caffeine!