I agree with stevegmu, smoking of any type has been too demonized in the US. Hopefully, over time, that will change as e-cigerattes, or I prefer to call it, vaping, becomes more known.
As for social acceptability, I have reached an age where I really don't care if people accept what I do or don't do. As long as I am not causing harm to others it is my business (gosh, I sound like a Cialus commercial).
Here's how I see it. In a land of smokers, where smoking is the norm and widely accepted, vaping is welcomed. Take my favorite city in the world, for example, Prague, CZ. One can openly vape at the airport, in taxis- with permission, restaurants and bars- in non-smoking sections at restaurants, at hotels, museums, the metro, pretty much everywhere. I didn't see cloud blowing, but I did see a lot of vapers. Vapers everywhere. No one seems to care, except for several vocal tourists from America and the UK I ran into at a restaurant and pub. Both were told by staff that e-nic isn't smoking, and is allowed...
Prague and the Czech Republic have a high percentage of smokers for the developed world. Smoking is allowed in most bars and restaurants and hotels. Advertising is legal, and there are price protections for smokers- cigarettes are the same price everywhere- at stores, kiosks, the airport, in machines... You even see politicians smoking openly...
There have been restrictions, as of late- not allowed in public buildings, except for designated areas, and bars, restaurants and hotels can restrict areas where smoking is allowed.
It is a bit disconcerting, at first, seeing so many vapers. As I began to explore vaping in Prague, I asked my Czech friends why so many people use e-nic, as they call it. They told me smoking is bad, they know it, everyone knows it. A lot of people there smoke, but everyone knows it is not healthy, makes a mess with cigarette butts and stinks. When they see vapers, they are welcomed and congratulated for quitting smoking, not looked at like a leper...
Another reason why no one blinks twice at vapers, except for tourists, is that the other is basically legal, well, not so much legal, but not illegal, to an extent... It isn't that Prague is lawless, but that as long as no one is being harmed, everything is OK.
Why is Prague so free and accepting? They lived under the nasiz, then under communism. They know what is like to not be free and will never go back. They aren't so far removed from dictatorships, or colonial rulers, like we are. We don't know the other side, but are gradually starting to become acquainted with it...
I don't think vaping will ever become commonplace or widely accepted in the US; maybe parts of the US, but not as a whole. I won't be here to find out...