well, in my college us ''smokers'' usually gather around a parking lot, its usually around 20+ people smoking (cig,weed). Now if you come to our group, you'dsee like 5-6 guys,just passing around a joint or two, thats where you go and ask. Goodluck buddy.
Idk about you,but here in canada,when i go back home at night,i get asked by randoms ''you want some buzz?'' but be careful, those usually sell SHIT-ass herbs. For real good shit, you wanna ask someone that is a pothead,and smokes the shit he sells.