Edit - I will say though that Adderall and coke are by far the most common for people from the USA. For whatever reason those are definitely the North American drugs of choice in my sample.
This is patently false, and I think your assumed universality of drug use is based in no small part on your use, and the crowds that you've associated with because of that drug use.
I certainly know some people who've used stimulants from time to time (SF bay area), but that's the rare exception, not the rule. I know some people who have used MDMA, cocaine, etc. at parties, but it's not many. And, being in SF, I of course know a ton of people who use marijuana regularly.
I'll accept that drug use is probably higher than what I see (I have the opposite problem with perspective: as a non-user, I tend to associate with non-users), but suggesting it's the norm and is "everywhere" is an excessive exaggeration.
> Students, software developers, people in finance - for all of them stimulants are normal.
That's absolutely untrue. For certain (very small) subsets of those people (well, software developers, at least, which is my main area of experience), it certainly happens, but it is definitely not normal.