I believe that the OLD camp stoves utilized CHARCOAL to generate cooking heat. Those could well be dangerous in closed spaces.
In the Coleman type stoves, they utilize PROPANE as a fuel. Many many homes also use PROPANE for both heating and cooking. A little ventilation insures safety. The big safety act with the Coleman is to instantly disconnect and remove the little gas tank when done A very strong internal spring powered closure insures no problems. Also the tank used is quite little and takes up next to no room.
We have a propane Coleman stove and I am aware that propane is used in furnaces as well, but they are vented. A repairman once showed me how to use a match to check to make sure the furnace vent is functioning and removing CO from the home.
CO is just something that makes me nervous; every winter there’s a news story about someone is our state who died from it. I’d hate to unknowingly poison my family while cooking on a camp stove during a blizzard.