At the gym I go to, there are a lot of college-age kids. I overhear them talking about getting on Ritalin or Adderall to help them study. Not because they really need it, it's just seen as a "performance hack" to get an advantage. They talk about what doctor they went to and how easy it was to get a prescription.
Have you ever taken a decent dose of an amphetamine? It isn't going to make you smarter but it will almost certainly boost your energy and ability to get stuff done.
The same is true for every individual person who takes it. At some dose it helps and at other does it doesn't.
And in the gym, it raises your heart rate so that hurts exercise, but without it I can't do any cardio because I get so bored 5 minutes in I have to stop.
