Is it Bad Form to use an Ecigarette or Vaporizor in the office?
"Bad form" is very context-specific.
In my office, itusing an Ecigarette or Vaporizor wouldn't be permitted at all, and thus would be extremely bad form.
You can choose to fight for your "rights" by learning what the local laws currently permit, and learning if your company has a specific policy regarding e-cigs. If not, you could choose to "vape" in spite of your co-worker's objections. For me, that would also be bad form, but perhaps in your local context it wouldn't.
On the other hand, you could choose to treat your e-cigs as if they were traditional cigarettes, and follow the norms for smokers in your locale. That might mean you have a smoking room, or must smoke outdoors. For me, that would not be bad form.