Okay, here goes...Your Disneyland example is better because it is a large place and the people can be quite dispersed in some areas.
I'm going to post the rest of this reply now and give this example some more thought.
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If people were able to vape somewhat freely they would be walking around vaping.
Not hiding in a corner somewhere, which is where this "sneaky" smoker would be hiding out.
In a world where vapers can walk around freely vaping, one prerequisite would have to be that the public was educated about vaping.
And in such a world, I think it is likely that people would be able to tell the difference between a vaper and a smoker just by watching them for a second.