Yes, it is semantics. When people say "Is that safe" and you answer "yes", what they mean is "Is that reasonably safe?", not "Is that 100% guaranteed to always be safe?".
Is walking across the street safe? Yes. Is riding in an automobile safe? Yes. Is eating pizza safe? Yes. Is taking a shower safe? Yes. Is vaping safe? Yes. Is second hand vapor safe? Yes.
Every one of those has some level of risk, but it's a low level of risk. And of all of those I listed, the two related to vaping and second hand vapor are probably the lowest on the risk scale. I'm sure I can find examples of people who have died crossing the street, riding in an auto, eating pizza, or showering. Can you show evidence that anyone has died from vaping?
But you want to make vaping sound dangerous, so you've been arguing semantics.
When someone asks me is vaping safe, I have no problem saying that it is safer than smoking, but still has risks due to lack of studies. At least I'm honest about it.
Again, NO LONG-TERM STUDIES HAVE BEEN DONE, all we have is short-term exposure. When something like this is posted,
saying that second-hand vapor isn't a hazard, where is the evidence that shows it isn't a hazard in the long-term??? Even the OP's math is based on a 3 hour exposure. That is not long-term.And you wonder why most of us think it is an absurdity to see second hand vape as a public hazard in anyway, even in a tightly confined space?