Far as I know the recent omnibus spending bill in the US had language in it giving the FDA authority to regulate tobacco free (synthetic) nicotine as a tobacco product. The bill has passed both the House and Senate waiting on a signature from POTUS. Companies will have to resubmit pmta's and have something like 60 days to come into compliance. The laws go into effect 30 days after the bill is signed. So for puffbar and others who were using synthetic tfn as a workaround it looks like that loophole just got closed up.