I think it's funny how people try to hide the fact they do drugs, either smoking weed or whatever you prefer. I'm going to use weed as example. I work at Quiktrip(google it, best place to work in Tulsa, Oklahoma) and I run into a wide variety of people on a daily basis. But the little things people say or how they present themselves give out their personality type. Such as not holding the door for people, or just the diction they use while asking for a product. For example a weed smoker, one will ask for a cigar or mini cigar. Just one, for several people. What does that scream? Pot smoker should be the answer! Another way to tell is the diction they use. Im required to ask "would you like anything else?" or something among that, when they say "nah I'm straight" or "im cool" who says that?! I would expect that lingo from a thug, but I usually hear it from a punk white bitch.
I'm just saying be careful what you say/do.