matthew maguire writes:

I would imagine that is why most misters now sputter or spit instead of
fog. You definitely want to use synthetic instead of soluble oil in
these things because of breathing issues.

I was thinking of the misters that just spray water, but with a little
ethanolamine or something in the water to prevent rusting your tooling and
machinery. It doesn't matter much between fog vs spray, because you're
going to get fine particulates floating about consisting at least of water
hardness minerals if nothing else after the droplets vaporize.