Steam from showers sets off some types of smoke detectors as well. I know of a student halls of residence that had them. In the uk that type of building is classified as high risk so the alarm system is directly connected to the fire brigade. Cue grumpy firemen making students stand out in the rain at 1 in the morning every couple of days while they search the building for a non existent fire.

Ok yeah I could see a problem if you had a gas fired oven. I cook electric, as long as I don’t burn the food the detectors don’t care.