Didn't you ask this same question a few days ago? I seem to recall that this same query was previously displayed on HN.
I take amphetamines because it is part of the medication that has been prescribed to me by a doctor for ADHD. I take my medication because it is nigh impossible for me to do anything that I am not interested in for more than five seconds. The unceasing flow of ideas and internal stimuli that I generate by thinking can be rather bothersome as well. Life is difficult when you are thinking of a solution to a problem, designing parts of software systems and considering the best approach to dealing with someone you had a tiff with (and more) all while you are supposed to be listening to your current boss, wife, lover etc. Life becomes more difficult when you forget everything you are supposed to be doing because you cannot pay attention long enough to finish the three second task you meant to finish five seconds ago because you forgot what that task was.
The beneficial effect of taking my medication is that I am better able to write code that I am not interested in writing, give closer attention to detail and generally operate like a human being without ADHD would operate. There is more to ADHD than just lack of focus. Lack of focus and all of the other things, lack of organization, forgetfulness, fidgeting, non-sequitur outbursts in conversation, lack of follow through... All of those things are why I take my medication and also the reason that I stopped listening to other people telling me that I should stop taking meds.
I do not think anyone should take amphetamines for any other reason than a real medical condition. I have no idea why they would want to. When I took dexedrine for the first two weeks I felt like hell. I switched to an XR dexedrine and I feel much better.
I know that adderall and dex are really popular with college kids to help them study. I have had people ask me if I would give them my medication, I guess they do not know or do not care that giving narcotic meds to people who do not have a prescription is illegal...
To each their own I guess. If you want to take drugs to code that is your deal. Why not just code without the meds if you can? I wish I could.
I guess I got a little ranty here. Sorry about that.