So far the MH-Z19 modules are on the top of my list for pairing with an ESP or something and logging data to NAS but I've yet to order any.
I think other models with auto-recalibration also suffer from this (including MH-Z19). It's probably not a problem for you, but if you too live in an extremely polluted area and have to keep your windows shut for weeks at a time, it might be.
At a company I used to work for we started wonder why one meeting room got especially rowdy if we had our 2 hour team meeting there.
Had the building management install a CO2 sensor, it got up to 1500ppm. We were practically drunk in there. Turned out it wasn't meant as a meeting room at all and it had zero ventilation ducts - they were all in the room next door, they had just slapped a wall to split it into two.
It might make you feel different - and maybe not great for being productive, but it would be hard to notice.
What sort of levels is it inside? Isn't it inert? (hence the problem of global warming)
