narrator: comp to rijuana, are more obvious, acss all populations of people. dr. miotto: we see a plight in urban america where crack cocaine is being sold on street corners by children to children. cocaine is a very powerfully reinforcing drug, and people chase the high. they use it, but they want more and more and more. cocaine is a stimulant drug, so individuals will feel euphoric. they'll feel energized, awake, alert, excited. they'll have great self confidence in their abilities. and much of that will be a misperception on their part about what their real abilities are. dr. miotto: people tell me, "when i'm looking for crack... if you ask me, 'give me your right leg,' i would say, 'take it. i want crack now.'" so it disrupts families, lives, criminal behavior run rampant. one of the worst things for me... my wife had bought a bunch of new stuff-- new tv, this and that-- and she had a good job, and we had a little kid... and... she had went out. and i sold everything. i took everything she bought for the kids, for her, for me, i sold it all. what really hurt,