Every breath you take, there is a 99.99% chance that everything is normal, and a 0.01% chance that you breathe mild acid which horribly burns and causes a massive coughing fit.

It probably don’t cause long term damage unless that breath happened to be more important than normal, like while driving right as a child runs into the road.

Would you act differently knowing that you had one of these occasional acid breaths? Even if it only happened once per day on average (0.001%)