I only vape where smoking is allowed.
I'm not sure where this mentality that government has the ability to tell us what we CAN do, comes from. This is a lie, and needs to be stomped out.
In the US, our legal system is based on a concept called "proscriptive law". Goverment can only tell you what you CANNOT do.
They can tell you where and when you CANNOT smoke.
They do not have the authority or the ability to tell you where you CAN do something, because as a creature with free will, you can do anything you want anywhere and any time you want. This is a simple, irrefutable fact.
Granted, doing certain things in certain places may not be good idea (having sex on a motorcycle while driving in traffic, for instance) because of common decency or public safety concerns.
But since vaping is neither obscene, a health or safety hazard to others, or prohibited by law in most places, it is generally legal to do just about anywhere.
Vaping anywhere there is not an explicit ban on vaping in the law or statutes is 100% legal.
On private property, the owners (or their official, legal representatives) can make up their own codes of conduct and can prohibit or restrict activities that are, under the law perfectly legal, just because they want to. For instance, in mny states, concealed carry of a firearm is 100% legal in private businesses if the person has a valid permit, but the owners of most shopping malls (being for the most part, European Real Estate Development corporations, and therefore loathe to the idea that individual citizens have ANY right to personal self defense) prohibit carrying ANY weapons no matter how legal such carry is. And they have the legal right to do that. (although the MORAL right to do such a thing is very easy to disprove)...
Stealth vaping marginalizes vaping. It makes it look like you are trying to hide something that is wrong. This reinforces the public's ill-informed ideas that vaping is smoking.
If vaping is not disallowed by law or statute, and the private property owner does not have an official posted policy against vaping, then it is 100% legal to do in a given venue.
Vape Openly. It is the only way to "normalize" this activity, and the BEST way to engage and educate people as to what vaping really is, and to the fact that it is, in fact, legal in most places.