You know, I get people who think about me (Pokemon, video games, the stuffed Remy from Ratatouille on my desk, the mermaids) and think I might be a doper, and they ask me to my face if I am.
So, the next time you find yourself in this situation, do what I do....
Say, "I don't drink or do drugs because, if I drank or did drugs, I'd be so weird!"
Shut 'em up every time. Stolen from Howie Mandell back when he was doing stand-up.