As noted, too much humidity can hurt. Dry air inside a house in winter means that the house is leaking a lot of air through myriad holes and cracks. Air leaking in one place displaces inside air going out through other such holes and cracks. That exiting air has more humidity than the incoming air, due to human activity inside the house. If you add too much humidity to the inside air, you run the risk of getting condensation within the wall cavities, possibly causing rot and mold to develop.
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