I want some Plume!

[N2Advnture]

According to MRN:

"The most current theory is that plume is caused by sudden condensation of volatile oils surrounding the cigar due to sudden fluctuations of ambient temperature or humidity. The oils condensed are subsequently re-vaporized. Leaving the minerals dissolved in the oil in a crystallized form. Hence they are needle-like if you see them closely."

The fluctuations mentioned would typically within a very, very short period of time and not long enough to cause any adverse affects to the cigar.

I hope this helps

~Mark