I got legitimately diagnosed with ADD (non hyperactive), and prescribed Ritalin. When I took them, either by eating them, chewing them or snorting them I got equally as "charged" as any of my friends would. The effects of the drugs just so happen to solve/treat the side effects of "ADHD", but there's no specific correlation. People who already can focus well, and aren't restless, will just focus better, and be more productive. I've literally seen dozens of other people take these un-prescribed to study or for recreation for the record.