I wouldn't say you're "wrong"
per se. But rules is rules... at least until rules change.
The primary reason most organizations banned "tobacco products" wholesale was that smokers often resorted to dipping or chewing, resulting in people spitting into something. Even if they're doing it into cans or bottles as opposed to the nearest trash can or water fountain it's a bit "gross", and if you've ever encountered a spill of such a container... well, it's just not pleasant.
Of course, within the set of "tobacco products" e-Cigs are a whole different class. No smoke, no spit. So they
might be exempted from such policies, but it would have to be "official" to get by without repercussions.
I would say that as long as no one complains, vape away! There's probably little to be gained from bringing it up right away. However... you should be prepared for the day someone does say something, at which time it would be worth bringing the issue up with whoever sets the policy to see if it can be changed.
Keep in mind that the onus will be on
you to prove that the vapor is equal to or no worse than an air freshener or someone's cologne/perfume -- especially if others in the office are known to use those items (I know us vapers
believe that, but to my knowledge such a claim is not incontrovertible - at least,
I have no
solid evidence to point to yet). So until then I would gather up as much evidence as you can to support that claim to back up an exception for vaping.
You might even draft a revision yourself. If you do so, a trick I recommend is to write it the stuff you want added in as close to the same wording and format as the original (which makes it more difficult for them to want to change) and include or leave in some items that, psychologically, they cannot prevent themselves from changing (which makes them feel important for having broken out the red pen). This can only increase the chance that they will leave the stuff that's important to you alone.
Good luck and let us know how all this turns out.