I think we're all guessing at this point. I'm not stocking up on nic at this time, but could see me doing it down the road. I think of risks in handling nic (probably minute, but not risk free) and in having that much around. Same goes with "other stuff" (that I know we can name now, but I'd rather not). I've never been one that thought having ounces of that around is a good thing, and instead strikes me as a thing that could lead to some serious jail time. I do think a good 6 months to as much as 3 years after everything goes down (enforcement is clearly happening), that own personal stash will be a non-issue. But also think at some point, they'll look to make examples of private hoarders just to make it clear that you now need to be super duper discrete with vaping if you wish to continue. And for those who have in their possession (at home) say 6 (30 ml) bottles of whatever, I think that could spell trouble, but nowhere near what 1 liter would mean if caught. In today's world, even with legalization happening, if someone is caught with a pound of other stuff, I think very very few people would say, "oh that's just for personal use." And most (ignorant folks) would think it a good thing the Feds got that dealer out of the way. And just to be clear, in this example, let's assume that it was all for personal use (truly was). I highly doubt such a person would be able to convince authorities of that.
So again, don't get caught. Be you a hoarder or distributor.