The FDA is an un-elected, un-accountable entity. All the petitions in the world will do absolutely nothing. The original legislation was carefully crafted to insure that no Congressional oversight, except the outright banning of tobacco or nicotine, was allowed. The only way to change things is by de-funding the legislation, and that will NEVER happen. Trump is no friend of tobacco. Congress is not going to get involved because appearing to support tobacco is political suicide. I'm sorry folks, but letter writing, petitions, etc. are just wishful thinking.
Eight years ago we, as a nation, voted for fundamental transformation. These FDA regulations are just a small taste of that transformation.