That mist is liquid and liquid is heavier than air. Therefore it is not going to hang in the air waiting to come up and get you. It will reach its height capacity stopped by the lid and start its return trip to down.
What about osmosis?
Speaking of germs, to this day, something I started as long ago as I can remember, if I see a dead animal in the road driving I stop breathing for a spell so I don't breathe in any nasties that might be picked up in the car.
Of course they would be picked up by the car's air vents and probably trapped to be breathed in later, but it's just one of those habits.