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No. should not be a problem. The amount of air and for the short time won't affect anything. It vents out the soffit which is under the roof line.
Yes of course it can, moisture is being drawn up & out of it. Keep bathroom door open to reduce humidity/moisture in bathroom ,wipe moisture from walls after shower, run an extra heater in bathroom to warm air, or don't use it/vent/fan for awhile til it gets a little warmer in your area.
Renee,
I think what you are asking is can the heat from the bathroom heater/exhaust fan cause ice buildup. Excessive heat and humidity in your attic can cause ice dams. The ductwork from the fan to the soffit should be sealed and insulated. One of the drawbacks to a soffit vent is the warm moist air leaving the vent can be drawn back in by your soffit vents. Make sure your ductwork is insulated, make sure you have good airflow from your soffit vents to your ridge vent if you have one, and most importantly, make sure you have a double layer of insulation on the attic floor, which helps to keep your attic cold.