New gas range setting off smoke/gas detectors
Yeah, you really need an externally vented hood. Sorry, but gas stoves put out both carbon dioxide and even worse, some amounts of carbon monoxide, which is much worse.  While it may not be an enormous risk, it's still important enough to vent combustion gases from a gas range to the outside. Really!  All you have to do to kill yourself is forget to turn off a burner or oven and go to sleep and not wake up again.   Sorry, dude, but you need an externally vented hood.