And don't forget that your propylene glycol is purifying the air for them.
Wow, I got some reading to do. Hmmmm I still do not understand why the car exhaust comparison does not fit with comparing second hand smoking rules in the great outdoors...
You should know that healthnz.co.nz is not an equivalent of the FDA or BMJ. That study was not peer-reviewed. The link you gave just has a table and some unsubstantiated claims. The lone source is the study itself. Again, no peer review. It seems as if you have just found a site that coincides with your beliefs and that is all there is to it.
One argument against car exhaust is many more people use vehicles than smoke and people need vehicles to work, etc so it's unrealistic to ban cars. Of course, there are groups trying to force you to buy an electric car for the environment. They conveniently forget where electricity comes from, though, lol.
Anyhow, a better argument is other permitted smoke outdoors. None of the people trying to ban smoking in parks and on beaches can explain why short-term grill smoke exposure is safer than cigarette smoke, thereby justifying allowing outdoor public grilling but not smoking a cigarette or even vaping an e-cigarette outside in some cases. They also claim that "there is no safe level" of tobacco smoke exposure, so commercial "smoke-busters" in buildings aren't an acceptable solution, yet they allow smoke in restaurants via wood-fired ovens and grills and bars with open grills because the ventilation is sufficient?? R
They have somehow sold the public on the idea that wood and coal smoke is magically SAFER than tobacco leaf smoke!
If I were an ANTZ in bed with Big Pharma (we need a Code Name for Pharma btw- lol), these facts would scare me so much that I would be afraid that those around vapers might truly smarten up and insist on change, so I would continue to insist on either banning nicotine's unregulated form or continue to "push" the ineffective NRT's , no matter what the price or consequence to those being helped.So the bottom line would appear to be that if you could take in enough nicotine merely by breathing in a room where others are using an e-cigarette that contains nicotine, you might find that your ability to concentrate and pay attention is improved, that your visual memory is improved, that your information processing abilities are improved, and that your symptoms of depression are reduced.
The point I am trying to make is that no matter how big or small the numbers are, it is getting released in the air and we have to be mindful of it as we don't know the full extent of the side effects. However, we do know how nicotine affects us physiologically and neurologically. We know that children and pregnant people are even more susceptible. I was making that point because I see a lot of ecig users blowing it off as if there is definitively no side effects from the vapor to them or others around.