As for the whole - fire in the igloo thing again - the fires started inside them were usually small - like was said - that first it was to help with creating a ice skin.

Being temporary structures, the Inuit didn't usually cook in their igloos - on hunting trips, etc., they carry dried meat, blubber, etc to eat - things that did not need to be cooked. They also carried a great deal of water with them - though the would melt water outside on larger fires.

Fires inside igloos are not good - not because of the heat - but because of the fumes and smoke. That's why arctic explorers use clean-burning gas heaters.