Cigar bloom is actually the visible appearance of the oils in the cigar, which usually happens only after the oils have been kept at a very sustained level for a lengthy period of time. This is something often found on aged or vintage stogies and is a highly desirable result. In fact, many enthusiasts prefer to smoke cigars with plume or bloom on their surface.
Had it actually been mold, the looks of the surface would have been noticeably different and rather than a generally dusty appearance, the surface of the cigar would have splotches of blue or grey discoloration. Though there are some ways to cure this, it is best to prevent it altogether by keeping a very constant eye on the level of humidity inside the box. It is also important to remember that a cigar that develops mold has probably also left spores behind in the box as well, and all possible steps to kill this mold without harming the box should be taken.
Other than the viewable dust or powder, does cigar bloom or plume have any other effects on a cigar? Most experts agree that the bloom itself has no detectable taste, nor does it change the bouquet of the unlit cigar. What most do agree upon is that it provides visible evidence that the cigar has been aged properly and under the finest conditions possible. Remembering that most people age cigars in order to mellow or enhance the flavors of the tobacco means that bloom can be used as a clear sign that a cigar is ripe for the sampling.
Photos via montecristosocialclub.com & memegenerator.netWhat is Cigar Bloom or Plume? by David Sabot