I just thought I'd add another little experience I recently had regarding my own e-cig usage.
Most people are interested in what I'm using and the occasional manager making sure I'm not vaping anything illegal. More inquisitive people than anything else.
However, I did almost get stopped from entering a concert venue on Friday. I had my eGo-C Twist with a Vivi Nova, a backup Twist battery (both 1000mAh) and a bottle of juice with me (just in case I somehow vaped through the entire thing. I was ~3 hours from my house so I was taking no chances) Anywho, before you could get in you had to empty your pockets of everything you had with you and get a pat down.
Not only am I a vaper, but I am a Type 1 Insulin Dependent Diabetic. So not only did I have needles, a meter, and insulin on me; I also have all my vaping supplies on me. Security looked at me like I was pulling out an armada of drugs. They (almost) snatched my Twists and juice before one of policemen they had their recognized what it was, and told them that they couldn't legally confiscate it, since none of it was illegal and would cause no harm to anyone there. After all that, I chatted with the officer and learned he was actually a vaper as well. He pulled out a Provari and we enjoyed a 5 minute vape session before I went inside.
So it was a pretty shaky experience ended up turning into a pretty cool conversation with a random officer who also happened to be a vaper, and the first vaper besides myself and my brother that I had met.