Not college pot smokers. Maybe other stuff, but no way did she need to visit the "seedy side of town" to buy.
I have seen that too. I live right by a university. A couple blocks down is the hood. College students walk in front of my house day and night in that direction.
Not all of them are buying drugs, I'm sure. There are some dollar stores and a grocery store down that way, as well as some pretty awful apartment complexes that cater to college students.