Wasting time on what we all know to be near meaningless makes you a concern troll. I'm all for regulating what you can inflict on those downwind of you, but if

Wasting time on what we all know to be near meaningless makes you a concern troll. I'm all for regulating what you can inflict on those downwind of you, but if you called the city inspectors because you were worried about second-hand e-cig vapor they'd arrive in a car that produced literally thousands of times more known deadly toxins. We definitely should start testing common things people use like deodorant, makeup, hairspray, e-cigs, etc. But if we do it in order of suspected toxicity you'll be waiting a while for those results. And if you read the list of things to worry about and get to where second-hand vapor is even visible on the cost/benefit scale, you will have to be living in a bubble.