Because currently they are illegal, and people take them despite the risk of being the close friend of a large muscular inmate, so therefore it should remain illegal. Nicotine and Alcohol on the other hand are not illegal, so people do not take this risk. Add to that, the statistics are not really comparable.
funny that though, since sex ed classes have been increasing, so have the rates of teenage pregnancy. also drug use has increased, despite the dissemination of knowledge. I don't really think there is anything we can tell the average joe about drugs that he doesn't already know.
as i pointed out though, it should remain illegal because of the risks people are willing to take.
see, I asked him specifically, would you take drugs just because it is legal. He said "yes, because ... it should be a freedom." I was confused by this so I wished to clarify that "were drugs legal, he would take them just because it is a freedom ."