Happens to me sometimes as well, but usually it just sparks a conversation. However, when I first started vaping, probably about a month or 2 in while sitting at a red light in my car happily vaping away, I hear some woman yelling. She was screaming "that's not cool ya know!" I looked around for a minute trying to find out who she was yelling at, then I saw her staring directly at me with this disgusted look on her face. I said something like "what are you talking about?", completely forgetting that my ego with a tank may look strange. She said, smoking that thing in your car like that! I could tell her husband who was driving was trying to get her to calm down and as soon as the light turned green he gunned it, but not before I could smile and politely say it's a ecig and I'm not smoking, I'm vaping. Not sure if it even registered with her or not, but it certainly was an eye opening experience for myself.