this is what the Min Ron Nee has to say and i quote:
"the sick period is the period when anammoniac smelll is still detectable in a newly manufactured cigar.
the tobacco leaf is moistened before being rolled into a cigar. this invites accelerated fermentation which generates a lot of ammonia. an unpleasant ammoniac smell is noticed.
unlike bitter or tannic tastes, the ammoniac smell is regarded as unpleasant by everyone.
the time period for the disappearance of the ammoniac smell is infulenenced by the rate of fermentation, packaging and storage conditions.
good vetilation gets rid of the ammoniac smell in no time. ammonia, a simple molecule (NH3), is highly volatile. if you cannot wait, and want to get rid of the ammoniac smell in quicker time, storing your cigars in the open if the atmosphere is not too dry, or opening your humidor or box of cigars fro some time everyday certainly helps.
a higher temperature also makes ammonia more volatile, so storing your cigars in a warm place like next to you kitchen stove might not be a bad idea.
(note that these practices might ruin the aging process in the longer term)
for the majority of cigars handled in the "usual" way, athe ammoniac smell will be over 90% gone in a few months, 95% to 99% gone by the end of the first year, and practically all gone by the end of the second year.
milder cigars, for example Belinda or Gispert, take even less time.
cigars should not be consumed during the sick period."
end quote.....