Water is condensing and fogging the far lower passenger side of the windshield in the mornings.It started as a small area and grew larger as the weather cooled.
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Do you have the heat on when this happens?

If you try to wipe off the condensation with a cloth does it smear or seem oily?

If YES then it is coolant vapor and you have a heater core leak.

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This morning there was vapor rolling out of the center dash vent.
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Do you have the heat on when this happens?

If YES, then the vapor is Coolant...and you have a leak.
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Could this be condensation from temperature swings? Is there a drain for an AC evaporator core box.
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There is a drain, it can bee seen looking from the passenger side/remove the kick panel to that side of the console.
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My experience has been that I have to run the AC to unfogg the windshield in cool damp or rainy weather, even when I run with the heat on, esp if I have passengers.

However the Vapor from the Center Vents, in your case suggests a leak in the heater core. Try the wipe test to see if the fog is greasy and hard to wipe off. Before you totally freak out on the prospect of a HeaterCore-ectomy