Its interesting how my answer to this question has changed through the years I will lay it out brief for you through answers from my past selfs:
(High school) People know I am a pot head and most think I am not as smart as I am and say things like "your in this class, this is honors I didn't realize you would be in this class" Its a split between people knowing me and having preconceived notions of who I am because of my "drop out style" friends. (smoked weed daily drank on weekends with a little of everything else)
(College) People are amazed at my abilities to drink and understand chemistry enough to get good grades on exams hung over. Those who try to do what I do fail and the kids in my classes have no idea who I am because they don't know me outside of class. Everyone assumes I will live normal life if not do well because I appear to be smart. (drinking daily, smoking weed/tripping/rolling frequently/infrequently
(post college) My high school friends I honestly don't know what they think of me, we haven't really seen each other in forever. Once I got out of college I started doing opiates and became a heroin addict only recently got clean again. I often wonder just how much my best friend since I was 8 knows. I was there when his son was born in 08 and then basically disappeared from '10 on because of his life and my drug addiction. When we get together we don't talk about it, he says "how are you doing" in a caring and serious tone, he must know something. I can not tell you how many times I have stood in silence over a blunt with him thinking "tell him just say "you know im a recovering heroin addict right?" he must know everyone has to know, you use to cop with pete and he still talks to him" only to leave like 30 minutes later without saying anything

its not often like 5 times in the past 3 years but still I cant bring myself to say it. as for my coworkers they are probably torn because they *know* I do drugs in a sense (long hair grateful dead Tees talks about festivals) but I am how do I say this without sounds conceded... the smartest one in the building short of the VP I think he is the only one a little smarter then me. (daily junkie occasion crack smoker to daily methadone daily weed smoker)
But yes my answers have changed dramatically. I am not where anyone thought I would be now and my almost 4 years at a state university as a chemistry/psych major does make me smarter then the normal never went to college office worker

yeah not what I thought id be doing at 28 I mean im happy but still lol
Yay overly long post!