I always thought PMTA applications were required for "new tobacco products" that weren't on the US market by August 8, 2016.
No--if I understand you correctly.
PMTA applications are required for all ENDS that appeared on the market after February 2007. Since the first (?) FDA deadline for submitting PMTAs was August 8, 2016, everything that was on the market between February 2007 and August 8, 2016, needs a PMTA. That hasn't changed.
The deadlines for submitting PMTAs keep changing, but not the dates when products were being sold in U.S.
What happens to the new products introduced after the August 8, 2016, deadline hasn't been addressed, to the best of my knowledge.
The grandfather date hasn't changed either: "It's possible that an ENDS product exists that may have been on the market in the United States as of February 15, 2007 and could be used as a valid predicate. However, the burden of identifying a predicate falls to the applicant, so a manufacturer would have to prove such a product is grandfathered."
That's how I understand it, anyway. If I'm wrong, please let me know.
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