The thing is that, if you have ADHD or ADD, you don't get a high from the stimulant medications. You slow down, become more clear headed, and can concentrate better, among other things. Also, the prescription process virtually guarantees that you cannot abuse the medication. this is a good link on current research. http://www.additudemag.com/adhdblogs/19/10197.html
Hope this helps, please post if you have any more questions.