There are certainly a ton of legitimate allergies out there, but when it came to smoking, it seems that every other person claimed to be allergic to smoke. I wonder how these people ever left there homes back when smoking was allowed everywhere. The fact is that a majority of these folks aren't allergic, they are just annoyed.
This whole discussion is moot. In the very near future I am certain that vaping will be banned everywhere that smoking is, and maybe even some places where it isn't. I went to Vapefest DC this weekend. The entire first floor of the Hyatt was covered in a thick cloud of vapor. Many vapers are obsessed with producing big clouds. That's fine, it's part of the hobby, but even when smoking was allowed everywhere, cigars still weren't allowed in most establishments because of the massive amount of smoke and the strong, although pleasant, odor. I doubt any of us smoked cigarettes to produce thick clouds of smoke. When smoking was allowed everywhere, buildings installed ventilation systems and smokeaters to help get rid of the smoke. Those systems are now gone. When smoking was banned, many businesses fought it, but times have changed. We have seen many businesses beat the government in banning ecigs in their establishments.