Pro-vape
I'm pro-vape, largely because vaping helped me kick a 45-year smoking habit. But the way in which it helped should give some pause to complete abandonment of controls.
I had set myself up for gradual weaning off of nicotine, with progressively weaker e-fluids. However, one bottle of the 12mg stuff turned out to have a ridiculously-high level of nicotine in it - so much so that I was confined to bed for a day. At times, I was in fear of my life, so fast was my heart pumping.
I survived (obviously) and when I was up and about again, I couldn't face the slightest hint of nicotine. So, all's well that end's well. Except that someone with a dicky heart (dickier than mine) might not have made it.
Of course, no-one meant to make that dodgy-dose bottle - but there are no quality controls on these things - none whatsoever. They may not need to be tested to pharmaceutical standards, but they need to be tested to some standards.