farah, you're a teacher at strivers university. what impression do you have of what's going on that, you know, josh is describing here? well, when i talk to my students about this, none of them actually use these drugs themselves, - but they all know people who do. - ( laughter ) and just judging from what they tell me about the people that they know who use them, i would say it is quite common, you know, 20% sounds right to me. and my first reaction was, "oh my god, this is terrible-- drug use, illegal, you know, irresponsible." but i have to say, you know, the students that i hear about from my students, they seem to be using it in a pretty responsible way. they have various tools to help them with their work, new features of their laptops, their blackberries, et cetera, and at term paper and exam time, they have this other tool. dr. abramson, what do we know about the long term effects of the use of these drugs on otherwise perfectly normal kids? that's a wonderful question. because we don't know about the long term effects. the