This is more than likely just physics in action. If this happened right after you started the A/C and the inside of the car is rather humid, the cold air from the A/C will condense the moisture in the air as it exits the vents. It only happens for a few seconds until the moisture in the air is below the point where the it will condense and the temperature inside the vehicle has come down some. This is completely natural/normal. I've seen it in my own vehicles many times, especially when I lived in the swamps of Georgia.

This is more than likely just physics in action. If this happened right after you started the A/C and the inside of the car is rather humid, the cold air from the A/C will condense the moisture in the air as it exits the vents. It only happens for a few seconds until the moisture in the air is below the point where it will condense and the temperature inside the vehicle has come down some. This is completely natural/normal. I've seen it in my own vehicles many times, especially when I lived in the swamps of Georgia.