I'll just throw in my view on the "tobacco product" vs "drug delivery device" vs "reduced harm" vs "-some new category-":
Like has been stated before (in whole or in part), a specific, (at least semi-)knowledgeable part of the government has already decided what electronic cigarettes are. They are electronic devices that contain nothing recognizable as tobacco but deliver a very addictive substance found in tobacco to the user, with the end result seeming to be that the user stops using tobacco. This makes them a drug/device combination used as a Nicotine Replacement Therapy for the purposes of quitting smoking, and should be regulated as such. The vast majority of the rest of the government knows little to nothing about the electronic cigarette, and therefore bows to the wisdom of the group who not only seems to know what they're talking about, but whose job it is to deal with such matters.
Far away from the enclave of Washington, D.C., there is a much larger, much more knowledgeable group who looks at the electronic cigarette and says "This thing looks like smoking, feels like smoking, and satisfies like smoking, but it seems to have nothing in it that's going to kill me (or at the very least, less in it that will). I like smoking, but I'd rather not get cancer or stink like an ashtray, so I think I'll go ahead and use this instead." To that group, they see something that, while not physically identical to smoking, is a complete replacement for it.
So, you have two groups looking at the same device in completely different ways, and both are really saying the same thing.
FACT - Electronic cigarettes are used in the same (or very similar) way that conventional cigarettes are used.
FACT - Electronic cigarettes can help someone quit smoking.
FACT - Electronic cigarettes (for the most part) contain nicotine, a substance that is primarily derived from tobacco.
FACT - Nicotine, on its own, is generally considered a drug, and is regulated as such.
FACT - Electronic cigarettes are consumables.
If you look at that list, you can see that most of us (FDA, e-cig user, and anyone in between) can agreed on some key principles. The difference is in interpretation. FDA says it delivers a drug, must be a drug delivery device. We say we use it like a cigarette, not as a medication, so it can't be a drug delivery device. The key is that it is a consumable product, and all consumable products are regulated in some way. This is a good thing. Without that regulation, we'd still be eating half-rotten meat painted with pig's blood.
So what do we do with that? We definitely say it's not a drug/device combo (for a multitude of reasons). It's not a food, since it has no nutritional content. We maybe could argue that it's a dietary supplement, but I highly doubt that we'd get anywhere with that. Really, the only thing that's left is to say that it's a tobacco product.
We have to keep in mind that this is a niche market. Even if there are (as some estimates claim) in excess of one million vapers in the United States today, that is less than half a percent of the total population. Ideally, we would create a new category under the FDA that is specifically for Electronic Smoking Devices (or whatever you'd like to call them). There would be a rigid set of criteria that would place a product in that category, and then it would be governed by an exclusive set of rules. Those rules would ensure quality, effectiveness of delivery, and safety.
Unfortunately, as a niche market, there will be no new category created. We will be slotted into some already-defined label and held to the rules that govern it. Down the road, when vapers encompass even 5 or 10 percent of the population, we may have a shot at becoming our own entity. Until then, we will have to play by their rules and do the best that we can.
For our own selfish purposes, for our noble goals of conversion, for the future of electronic cigarettes (and by extension their owners), we must slip quietly into the tobacco product group and meticulously chip away at the walls.
-Nate