When my oldest was 5 this is what he told a firefighter who was telling the homeschool group about the importance of fire alarms,
"I know our batteries work in the fire alarm at home
because every time my mommy cooks
it goes off."
Everyone got a tremendous kick out of his very solemn and serious response.
A little disclaimer here, when the oven was on, it would smoke because of things burning in the bottom from overflowed dishes NOT because I was burning things. ; )