T.B., that's not true at all. There is one, and only one, primary purpose for all the existing electric / electronic "herbal vaporizers". You know it, I know it, the FDA knows it.
Sure, some people may fill a plastic bag with vaporized green tea or something, but 98% of them have the alternate, non-advertised ingredient in the chamber.
However, how it is marketed, and presented - nice and clean - makes it 100% legal.
It's actually quite funny. If an e-cig had been primarily developed to smoke illegal alternate substances, it would have been marketed as a herbal vaporizer to begin with, and there wouldn't be the issues we have today trying to replace a LEGAL substance, LOL. It's all quite ridiculous.
It's not getting cute, there are legal, and illegal ways to use 1000's of things.
Just because you can use something to do something illegal with it, doesn't necessarily define the device itself as illegal - especially in the case where there is a valid legal way to use it.
There's no reason in the world you can't fill a m401 P.V. with herbal extract instead of NIC juice, and market it as such... just like all the other herbal vaporizers.
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As for the nic liquid itself, sadly, I agree with you. With one exception - I don't believe it has anything whatsoever to do with health, since there aren't clinical trials and banning of a new flavor of imported pipe tobacco etc, which contain the same, if not more nicotine than a bottle of juice weight for weight.
It has to do with big tobacco lobbyists, and TAXES.
Money makes the world go 'round. Some people see part of the heavily taxed smoking "cash cow" leaving the herd, and are applying pressure to rectify it before they lose control of any of that multi-billion dollar cow.
I BET when the smoke clears (heh, sorry for that) , there will be a pack of MARLBORO e-cig carts available at every corner store or gas station, and it will cost the same as a pack of cigs, and will have the same tax on it as a pack of cigs. And the "clinical trials" will be some trivial tobacco company sponsored garbage, probably less informative than the existing Ruyan studies. Because, that is the way it is.
Just my opinion ;-)