I do not think that the laws, as currently written, give the FDA the power to do that. If I'm right, then Congress would have to pass new anti-vaping/anti-nicotine laws first.
Is it possible for government to make the stuff we already have illegal? Yeah, in principle it is. But even the Volstead Act didn't ban possession and consumption of booze people already had on hand, so I'm having a real hard time with the concept that they'd get so heavy-handed. In the unlikely event they do, the question would become: How many people would fail to recognize government's moral authority to do that?
my thoughts are they know from past experience they will have
to be very draconian in their approach to regulations if in fact the
end game is to hand everything over to BT and BP. i mention BP
because in a worst case scenario they would make the juice to
pharmaceutical standards as they will claim its the only way to
guarantee the safety for consumers. this is all doom and gloom
worst case speculation on my part.
after reading the proposed deeming regulations twice i am still
not sure what there intent is. it contradicts itself many times.
in one part it says it can't regulate the hard ware in another part
it says they can and will regulate the hard ware. the same holds
true for how and why they handle nicotine itself. Zeller says they can't
regulate nicotine from a non-tobacco source. the deeming regs indicate
they consider nicotine to be derived from (not a derivative of) tobacco.
that puts nicotine from any source under there thumb.
i a not saying they will come down hard on us but,if they are serious
i don't see any other way for them to proceed. regulation creep will take
to much time considering the availability of the raw ingredients and us
having the internet,thus the world as our suppliers. i think they will
be going for the whole nine yards at once in hopes that the courts
can't do anything. after reading the pertinent legislation i believe they have
the authority to deem what they want and only congress can interfere.
i do agree with you in that as for supplies already in your possession
there might not be anything to be done about that. however be careful
on how much you have have on hand. too much of of any arbitrarily
deemed raw material may be considered proof of intent to distribute.

regards
mike