Preface: Keep in mind, I use a cigarette lookalike, which does not produce a large plume of vapor, so it's a bit easier to be discreet...
I have vaped in a restaurant (yes, singular; I don't eat out much) - My son and I were there for lunch, no other diners near us, and the waitress just smiled and asked if we would like refills on our drinks.
...at the mall - not in the stores, just in the open food court and along the pathways. And in fact, there's this guy who works at one of those carts in the center of the mall, that sells cell phone accessories... he has a pretty sophisticated system and I see him
vaping all the time.
...at the movie theater - not during the movie, but before and after. I was vaping while ordering popcorn once and the gal behind the counter just seemed fascinated.
...at the hospital - I took my son to the emergency room a week ago... I asked the triage nurse if I could use an electronic cigarette in the waiting room. His response: "I don't think so?" - question mark, LOL! - I went outside instead, at the benches right under the no smoking sign. Police passed by, EMTs, security guards, nurses, doctors, hospital employees, patients, visitors, etc... a few people stopped to look for a second, but no glaring and no hassles.
...at a different hospital a few days later - The Kaiser hospital has 'no smoking on campus' signs EVERYWHERE. I went out to a shady spot under a tree and vaped off and on for about an hour. I was approached by someone - not security but an employee - and at first I thought for sure she was going to ask me to stop, to inform me of the no smoking rules... She didn't. She was just concerned because I had been out there for an hour; she asked if I was waiting for a ride, I told her that I was just waiting for my turn to see my grandbaby in the NICU. She congratulated me on my new grandbaby and went on her way.
...at the grocery store - I'm very discreet, though. Like another poster suggested, I just hold it a bit longer and then exhale through my nose, and only when I'm alone in the aisle.
...I do not vape on the bus, or when on my son's JR high school campus. It's not tobacco or smoke, but I don't want kids to see it and think, "Hey, cool! I want to do that!"
MTLBYAKY
Jana~