Since this is an Advance Notice of Proposed Rulemaking, after they're done evaluating the comments they receive, the'll have to publish a Notice of Proposed Rulemaking, which has its own comment period, but it might be shorter. Then they have to publish a Final Rule. I would think that it will be at least a year, perhaps two before a Final Rule is in effect.One question I have is how long it would take after the 90 day comment period for the FDA to restrict flavored eliquid. Does it require a process over time to enact this ban or can they pull the plug almost immediately?
Of course, @untar is correct. If a liquid wasn't on the market on 2016-08-08, or wasn't been registered with the FDA by 2017-10-12, they could "enforce" against it immediately.