There is already a black/gray marked near many schools (for the younger, there are cigarettes and for the older there is weed.) it’s a market where there is just one person selling, it is more a fluid market where the young people sell and buy to each other, mostly there are multiple kids with connections to get the goods in any school and then it rotates through the different kids by selling, buying, stealing etc. Source: I’m 26 now, and don’t believe that has changed since I left school.