Inside the humidor cigars should be stored at a relative humidity of approximately 68-74%. Generally it is assumed that the typical cigar flavors can best evolve in such a climate. This level of humidity supports an even burning of the cigar. At a relative humidity level of 70%, and a temperature of 64°F (18°C) the air contains approximately 10 grams of water per cubic meter of air. In such an environment, the cigar should absorb the ideal rate of humidity of 14% of its weight.
Dry cigars become fragile and burn faster since their burning is not slowed down by the cigar’s natural humidity. The cigar takes on an aggressive and slightly bitter taste.
Damp cigars, on the contrary, burn unevenly and take on a heavy and acidic flavor.
A few aficionados appreciate these modifications to the cigar flavor and therefore intentionally store their cigars in a drier or damper environment. In the 65-75% range cigars can be stored for long periods of time without any concern. Caution is required, however, if the humidity level should exceed 80%. In this case the cigar can begin to rot and mold.