The FDA is also moving up the deadline for market applications to August 8th, 2021, or a full year earlier than in a previous proposal.

Commissioner Scott Gottlieb isn't shy about the potential impact of the new rules. Some flavored e-cigs would be sold only through methods that prevent sales to kids, he said, while some flavors might leave the market altogether. The FDA also wouldn't rule out taking action if there's a surge in youth demand for 'plain' e-cigarettes.

The rules are open to public comment for the next 30 days. If they're finalized as-is, they could have a significant impact on where you can buy flavored e-cigs -- you might not see them in convenience stores, for instance. Not that the FDA is likely to shed a tear. It has accused brands like Juul of undercutting attempts to curb teen e-cig use, and it clearly feels that tougher rules are necessary to keep vendors in check.