So anaerobic fermentation of tobacco doesn't take place? I beg to differ, as does
Mr. Oulette and several others who's blogs and articles didn't make the first page of a Google search. As Russ notes, it isn't the same as aerobic aging, but changes most certainly take place that benefit the tobacco - otherwise, why would anyone buy a five year old tin of Escudo from consignment when a new tin can be found at less than 1/3 of the price?
That said, don't take my word for it (or Russ' for that matter); but rather take a read of this rather hefty article on the
Flora of Tobacco from the Bio-Chemistry dept. at UCSF for definitive proof.
I have actually workied out the methodology to run some experiments along the lines of what actually happens; albeit more for the artificial aging methods. What I am proposing is to purchase six tins of tobacco from the same production run - lets say OGS. One of these tins I will open, swab and perform a bacterial count as my control. The second tin, I will open, and age in a mason-jar for a set period (say, 365 days), then swab and count, while the third will be opened and jarred, but placed in an incubator for the same period. Tin three will remain sealed for the same period (365 days) before it is swabbed and counted. Tin four will undergo 'tin-baking' as outlined by Dr. Fred Hanna prior to swabbing and counting; while tin five will be incubated for a set period of 365 days as opposed to baked.
I theorize that the anaerobic bacteria actually flourish due to the baking process, artificially aging the product - but due to the high heats involved, the tobacco ends up becoming slightly stoved - or even steamed in the tin. Furthermore, I hypothesize that by incubating a tin rather than baking it, one would get the same effect in the bacterial bloom, however the lower tempuratures would keep the tobacco closer to the original flavour profile. I would expect to see a similar effect in the incubated jar; however with the aerobic bacteria thriving.
Now if only I had a good way to justify dropping $500 on an incubator to the wife, I would be set...