We all prepare for the worst, that's why we belong to this great forum. My home has hardwired battery backup smoke detectors in each room of the house(except bathrooms and the kitchen) and a combo CO/Smoke detector on each level of the home. It would be a true tragedy if anyone was poisoned/killed for lack of a $30 dollar battery operated CO detector!
Therefore I would recomend that if using any fuel burning appliance ie lantern, stove or heater, to use a carbon monoxide alarm. They are a cheap (less than $40) form of life insurance. We try to come up with ways to justify to our mates/partners/spouses that neat new $130.00 knife that we want, A CO detector protects everyone!
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If it ain't bleeding, it doesn't hurt.