Surely lack of regulation also increases the risk that people are vaping substances with toxic chemicals in?
We've got regulation 
Eliquid is regularly tested for both ingredients and emissions.
What we haven't got is medicinal regulation because there is no point in doing stuff like making every puff on an ecig the same length or making every puff deliver the exact same amount of nicotine, or making every ecig fire at exactly the same temperature, every time. Regs like these, which you can't really have med regs without, would be counterproductive. Vaping would become as dull as fuck and innovation would move at a snails pace because everything would need to be tested to medicinal standards before it reached market.
Currently new tanks and batteries have about a 3-6 month cycle before a new version is released (often incorporating new safety features suggested and designed by vapers and which would never occur to MHRA, removed as they are from the world of everyday consumer products). Med regs would turn this cycle into 2-3 years for small modifications which common sense could tell us change nothing in terms of risk. We'd all still be stuck on some super safe version of cig-alikes if MHRA had had their way.
We'd have about 4 flavours available too because med regs are so much more onerous than consumer or even TPD regs. Before you start, these are food flavourings. You inhale them anyway in all sorts of situations. If you're the nervous sort (which you obviously are) make sure you don't stand next to anybody sucking a boiled sweetie. Clearly this shit is deadly.
Medicinal regulation would make vaping massively less attractive for no health gain. Fewer people would switch and so more would die. It would be a huge own goal for public health.
Why allow the widespread use in public spaces of something unregulated for which the long term health risks are largely unknown?
Oh I properly agree. The sooner we ban all those unregulated and untested cleaning and cosmetic products the better. Point me at the petition. I promise to share it without laughing.
As for public health in this country, it has been based on the premise so far that vaping is not going to become a trendy or wiedspread thing to do. If it does become trendy, you can guarantee it will become more regulated.
Seriously will you please do some reading? This could not be further from PHE's position. They would absolutely love every smoker in the country to switch to vaping instead. All 9 million of them. It would prevent so many early deaths and so much painful ill health and disability.
And young people who have never smoked are beginning to try it out for social reasons, and you have said yourself that e-cigarette use has increased hugely in recent years.
Oh come on, we've done this one already. Trying an ecig does not equal regular use. Vanishingly few adults or children who have never smoked are using ecigs regularly. Vapers are about 50/50 ex-smokers and people on their way to becoming ex-smokers. Yes, ecig use has increased rapidly in recent years. That's because it's enabling a fuckton of smokers to quit a habit that has a 50% chance of killing them. What on earth is your problem with that?
It is becoming an unsurprising thing to see and vaping shops have started opening up on town high streets. There is obvious, massive commercial potential in it as an industry.
How dreadful. Independent vape shops, largely run by vapers, are managing to make a living by helping smokers to quit and helping vapers stay of the fags. Again, what exactly is your problem with this?
I presume you can vape all sorts of things if you want to if it's also an unregulated industry.
Yeah, just like you can stick whatever you want in a rizla or your slow cooker or your Breville sandwich toaster. Would you like to ban spoons because some people use them to cook up?
You kind of drivelled off into bollocks after this point so forgive me for not addressing any more of the fascinating arguments in your post. It all looked like stuff we'd covered before anyway.
It doesn't really matter how much evidence I post, how many links I give you, how many reading suggestions. You won't look at any of them. You'll continue to throw your hands up and say we just don't know! and scrabble to find increasingly tenuous reasons why vaping is A Bad Thing, when in fact it could save tens of thousands of lives in the UK alone.
What I reckon is this: You can't quite get past the fact that vaping looks a bit like smoking, that we're enjoying ourselves, that we're not dying and we're not sorry.