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If the heater was on recirculate for an extended period of time and there is a high humidity situation in the car (snow will do it) fogging will occur. Have you had the car full of people recently (exhaling humid air)? Drinking lots of hot coffee in the car contributes heavily to high humidity.
Driving 20 minutes or so with the heater on fresh air will clear things up, unless there are other issues here that are adding humidity to your car, like a heater core, or a leak into your passenger compartment.
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