Why should we know better?
The majority of us are not scientists, we are end users. We simply don't know - pretending otherwise just makes us less credible.
Of course I want it to be true, and all indications are that it is true - but I don't think we can say it's a fact is all I am trying to say.
Because it's already been researched. I'm not talking about vaping, I'm talking about second-hand vapor. Look up a MSDS for PG and see what the safe exposure level is. It's far, far higher than the minuscule amount from being in the room with a vaper. Same with nicotine. It's already considered harmless in small amounts, just like caffeine and we know it's only present in miniscule amounts. We don't know the long term health effects from sucking lungfulls, but the second-hand vapor poses no threat to a budgie, let alone a person.