It is a combination of some of that and a few extras. the trapped moisture held closer to the cigar and the somewhat warmer environment, no air circulation, and its dark. im a newbie at cigars but i do grow plants in a terrarium, and have had a problem with mold. so if you have a closed tube i would either open one end for the air to get to it a little more, or once a week take it out blow in the tube to replace the stagnant air. but then again i am a cigar newbie so i may be wrong, but thats what i think could work to reduce the chance of mold.
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