My wife brought my attention to this phenomenon this morning as rain began. The drops of rain occasionally made puffs of smoke. I assume it was some kind of tiny puffball fungi being broken by the raindrops, making the spores disperse looking like smoke. More research is needed.
I also thought of the possibility that it was some kind of ionization of dust particles, or plasma induced steaming, since there was a nearby lightning stike that cut power to the house shortly after. Any information would be welcome.