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Too much CO2 is also bad but you have to have a pretty airtight home, live with a dozen other people, never open your windows, and not go outside for days before it approaches being a problem. Which does happen but at that point you don't really need a detector to figure out you need fresh air.

DO. NOT. F#@%. THE TULPA. If once you start down the incel path, forever will KHHV mog your destiny. Consume you, SMV will, as it did Obi-Wan's apprentice.