White smoke from AC vents

I noticed white smoke or vapor coming from the AC vents when AC is on. When I change setting to recirculating air from inside of car as opposed to outside the smoke or vapor stops. Dealer service adviser told me it was because it must have been humid outside. I said, "What if I lived in Florida where it is humid all the time? Would I have to just tolerate this?" The look on his face was priceless, but he still could not answer my question or solve the problem.
Help!