Humidity control is similar to heat control. If you warm rocks around the camp fire and place them by your feet in sleeping bag you'll have warm feet late into the evening. If you warm a piece of Styrofoam, not so much. Cedar, cigars, boxes, kitty litter, Bovedas all act as humidity sinks in your tupperdoors. If you put dry cigars in a tupperdoor with lots of "humidity sinks" you will stabilize faster and maintain more even humidity levels.