I just went and looked at your links, which (while interesting, especially the one which says that Starbucks allows guns but not ecigs -- another phone call's in my friend's future so I can hear about this one!) are all from message boards. Now, this is not to say that message boards don't give good info. After all, ECF is phenomenal for good info.

But the person who I got the info from has a copy of the corporate handbook in her car, and oversees an awful lot of stores, so I kinda have to give some credence to that.
It's really easy for one employee to assume that 'no cigarettes' means 'no anything that looks like a cigarette'. Given that I live in a state which has entire no smoking cities (yes, entire cities in CA have gone nonsmoking-in-public only), parks, etcetera, I'm really familiar with the hostility towards anyone seen to be doing something which might look like smoking. I don't condone such hostility, mind you, but I'm intimately familiar with it after having smoked for 25 years. It's unfortunately to be expected that the hostility will, at least for a while, be extended towards those who vape, too. This will be far more prevalent in corporate chains because they are terrified of lawsuits (and if you don't believe that, look at all those cups that warn that your coffee is, in fact, hot). And there's going to be problems with
vaping at some stores, and acceptance of
vaping at others, and it all really depends on the staff at the store as to which end of the stick you'll find.
That said, if one store asks you not to vape there, I'd shrug it off and... just not go to that store for
vaping-time, that's all. Other stores can and do allow it. I know, as I've vaped at Starbucks. Did it yesterday, in fact.