It's not the gov't's job to protect you from yourself and whenever they do, the unintended consequences are of greater harm to your health and your pocketbook, than anything that the free market could do. Except in rare occasions - ie criminals that should be prosecuted to the full extent of the law - businesses don't want to harm their customers, who are their only chance of making profit from their goods. Most of the raw materials used in ecigs already have some 'regulation'. VG and PG have been around for ages and have tests done on factory workers for the inhalation of these substances. Studies that go back to 1947 that have shown no harm to workers. The metal industry has gov't and their own standards. So do batteries.
But just as in the car industry, for example, you could use any industry - guns, hair dryers, food processors, etc. NOTHING stops idiots from harming themselves - neither gov't standards or industry standards. And unfortunately, because of trial lawyers mainly, even IF there is nothing wrong with a product, it ends up being the businesses' fault, mainly because of media, the make up of juries who have been propagandized through gov't schools and movies and TV that depict business men and women as criminals at a rate that is far beyond, multiples of actual stats, of what actually happens in reality. All are murders, racists, sexist, arsons, thieves, embezzlers, polluters, mean, hateful without compassion. And that likely depicts no one you know with whom you do business on a daily, weekly, monthly or yearly basis.
Add that all up and you get someone who thinks that if the gov't gets involved then 'you
know it will be safe'

And nothing could be further from the truth.