First and foremost, having been prior-E and now part of the "dark side" of the ol' military. I can pretty much guarantee that absolutely no repercussions can be "handed out" for e-cigs until an actual Written Policy (local, group, fleet, or DoD wide), Regulation, or an Amendment to a Regulation is in place. You can't just go by "word of mouth" or some Ensigns verbal warning or rumor that they've been banned, outlawed, or what have you.
Remember when that fellow got his tounge "forked" in... I believe it was the Army? They took 2-3 years to finally put in a policy that no military member shall have his/her tounge forked, and they gave the guy that was already in with it forked a waiver. So until there's a "formal policy" I wouldn't worry about it.
Now then, if someone DOES write up a formal policy and it's unit specific, or local to your port / ship.... that doesn't mean it's banned Navy wide, and someone... even you... could ask for a formal appeal.