Modafinil is abused as a smart drug by students, entrepreneurs, stock market traders etc
Same people who use adderall for work.
Same people who use adderall for work.
That'd be either exceedingly rare or borderline unwise.
I'd love to see some actual forums or papers about that because this seems very unusual given the partly overlapping effect but significantly different paths.
Whatever is available currently.
"People who use adderall for work" is a generalization, for example stock traders at Wall Street are famous for doing cocaine, taking amphetamines for work and possibly every smart drug, including modafinil.
But they won't take them all at the same time because then they get too high to work.
Modafinil is extremely easy and cheap to get for anyone with one eye and one working finger, Adderall a tiny bit harder but easy for a "trader".
"Possibly every smart drug, including modafinil" is just many guesses mixed up, nothing to actually discuss with. I'll stop wasting electrons here, you do you.