amounts produced are enough to harm you because houses are an enclosed hvac system and even if it was enclosed people dont have their air running 24/7 to vent out anything anyways. Thats why a gas leak is dangerous in a house, because it builds up. NO SHIT YOU SAY? its the fucking same thing with living in a room with plants and sleeping in it at night. You are both producing co2 in an enclosed space. If your garden air recirculates and you don't have it exhausting outside you will run into lung problems. FIRST HAND EXPERIENCE HERE. Everyone thinks (just like I used to) that plants produce oxygen and we produce co2. But that's only the cause during the day. At night they produce co2 just like us.
I can tell when there's high amounts of co2 the air just seems stale and really really heavy and thick without having a high humidity. Its the most annoying type of space to live in. It is not clean air at all.
In every grow journal it tells you, you must have an exhaust fan and intake fan. They should mention the exhaust fan should NOT be where anyone sleeps and most preferably outside if you have a carbon scrubber on it. It should also be made aware why you don't want to recirculate grow room air where you sleep for health reasons. No one really knows about this shit and the ones that do haven't published enough on the subject to make people aware of it yet.