Like the Romans used to drink from lead cups. Something like that.
(it appears that the moderator is removing any replies with which he disagrees. It might be a piefed issue. But all the removed replies are top level and upopular. Stranger coincidences have happened I suppose.)
Gas stoves have powered vents.
Powered doesn’t mean the vent exits outside.
Vents that vent to the outside over gas hoods need to be required by law, otherwise, it may, or may not.
When I bought my house, I’d never seen a range vent that didn’t vent to the outside, so I didn’t know such things existed. I didn’t check, and mine doesn’t. It’d be at least $8K to have a hole cut in my roof for the vent to run to the outside.
$8k if you pay someone to do it. <$300 if you do it yourself. I’ve done it twice, once for bathroom exhaust and once for the stove