How can you not find any, it's EVERYWHERE.
You gotta just strike up random conversations with people and get them talking about smoking, then go for the kill and ask if they know who/where/when/how much.
Nearly half the population has tried it at one point, and millions use daily. It's out there, just gotta ask around.
Be warned, anyone you don't know, won't trust you. Take your girl with you, makes it more believable imo.