I am a low-dose "responsible" (in my opinion) user. I take very small doses daily to support my ADHD and narcolepsy. I find that I can concentrate for many hours straight and NOT fall asleep, which is really amazing for me. (I have narcolepsy with cataplexy and have nodded off while talking with a client at their house, in a meeting, and while driving! It's pretty bad...and nothing else has helped.) I maxed out on my insurance's "allowable daily dose" of Adderall, and was dozing off numerous times daily and napping twice, while losing focus often, too. A friend offered me some crystal, and I've been stable since, as long as, well, supply is stable. So, yes, if you do it right, and treat your body right, as the previous poster said (exercise, high protein, lots of water, vitamins and minerals), you can manage it.