Actually, one of the main reasons that spinach that's been cooked to death is less healthy than spinach raw in a salad is because most of the nutrients have been either cooked off with the steam, or left behind in the cooking liquid. If the heat from cooking destroyed most of the good stuff, then soups and teas would be as nutritionally relevant as water. Of course, I don't really know at what temp nutrients start to break down, and I'm pretty sure that the heating coil in the atty gets pretty toasty, so I won't say that e-juice would be an effective delivery method.
However, the more I think about it, the more I wonder about the safety of such a delivery method. Let's say that it works, and all those lovely minerals and vitamins get absorbed right into our blood stream. Isn't there the risk of an over-dose? We tend to think that if something is good for us, then it can't ever be bad for us, but EVERYTHING is bad for us in a high enough quantity. We can avoid ODing when we take our nutrients the traditional way because most of the excess will just pass through our system.
However, if we absorb it directly into our blood stream, we've cut out some very important middle men, and there's no real way to get the excess out before it could do damage. And even if it doesn't act like a Pulp Fiction OD, we need to worry about build-up. Anyone ever have kidney stones? That's usually from to much calcium. Passing one ain't fun. And then there's your lungs! You thought that tar build up in your lungs was bad, we'd have to be huffing CLR just to clear that crap out.
Now, you want to tell me I'm wrong on the above, please do. I'm just some guy with a slightly above average knowledge of how the body works, so I'm probably wrong on a chunk of that. But I do believe my reasoning to be sound (doesn't everyone believe their reasoning to be sound, though?), and I am more than aware of how stupid people can be when it comes to nutrition. "Oh, this is made from nature, so it's go to be healthy!" And then comes the anaphylactic shock or some such...