All wood, whether finished or not absorbs whatever is in its surroundings. Dryness will shrink the wood and cause it to split from lack of moisture. On the other hand, too much moisture can swell the wood and cause it to crack and split. General Rule: If the temperature and humidity in your home is comfortable for you, then your wood cabinetry/furniture should be fine. Avoid placing wood pieces in front of heating or air conditioning vents. The temperatures that come from the vents are too extreme.