system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What gives different people's houses their unique scent?

I think I could be blindfolded and know whose house it is just from smell, and objects from there also carry the scent. Is it just perfumes and air freshener or something else?
gpt
It's usually based upon what kind of pets you have, what kind of laundry detergent one is using, what you eat/cook. And a ton of other factors like how well your house is kept/having no moldy foods, what temperature it is, etc...