Do I need my fan on when cooking in the oven?

Eaither smoke is good as long as it works. They will both give you plenty of time to get out. And make up air with anything that burns is good advice. If you use your fan, make sure you open it on the outside. Many have a latch or push pin that the fan motor cant open by itself. So if yours isnt working check that. Mine works ok. More reasons to cook outside.