We can Challenge Individual Parts of the FDA "Deemed" Rules.
Such as Closed System Cartridges. Or Limits on Nicotine.
But I Don't believe a Legal Challenge that the FDA does not have the Authority to Regulate e-liquids that Contain Nicotine as tobacco Products (after deeming is Approved) is possible.
Like I said Zoid, IANAL, so you may well be right. But I do believe any and all regulations can be challenged in a court of law, and can be overruled or set aside depending on the outcome of the courts decision. Hopefully we will never get to that point... but I'm afraid we will. I think the biggest question is if we will have the backing and the wherewithall to challenge this decision if it takes place. I also think that depending on the timing of the implementation of the deeming regs after they pass (which unfortunately I'm fairly confident of), an injunction will need to be sought before the court case can even be fought.
And to be clear, the only part that will need to be fought is the deeming of vaping ejuice and components as tobacco. Everything else seems to be ancillary to that. That is the core issue that needs to be fought. The rest falls apart without the deeming as tobacco.