Still though not all containers are airtight, many seem near airtight. Hypothetically I would also like having one to keep cigars, pipe tobaccos, ryo’s (if I haven’t quit by then), and not quite perfectly sealed/resealed snuffs. Doesn’t having more humid air surrounding a container help prevent osmosis of moisture and aroma/flavor, which drier air would somwhat tend to “pull out” of one’s tobacco products? I’m trying to use better containers etc. But still I wonder. This is maybe more of an acedemic question than a practical one.
I keep several snuffs and snuffboxes in my humidor and can tell you there is still scent transfer in that environment. I’m careful to only put unscented snuff in there. I keep it between 60 and 70 percent.
There is no transfer of anything if the container is airtight, there is no osmosis or any other reaction possible between the contents of an airtight, non-permeable container and the atmosphere around it. I am only talking about airtight containers; if your snuff is in one it will not dry out or be cross contaminated, it can’t, there is no mechanism for that to happen within the laws of physics. Nothing out, nothing in - and it will keep for decades in perfect condition. Try it for yourself - take an airtight container and put a test sample of a moist snuff in there. Put it on a window ledge in full sunlight for a few weeks, submerge it in a bucket of water for a month or two, keep it next to some Gorgonzola for a spell. If the container is airtight your snuff will not have altered in any way. It’s not an academic question, just a fact.
If the container holding the snuff is not airtight that is an entirely different matter and in that circumstance a humidor would have an effect, depending on a whole lot of variables - but no more, and possibly less- depending on the humidor itself - than moving the snuff back to an airtight environment.
@Snuffster exactly. If its not airtight the fridge will just help you get that nice onion zest you’ve been looking for.
Man, someone should have done that with this jar of Grunt I just got in the mail. Woah! This stuff is rancid! I suppose the oils went bad? I tried mixing it with other things to see if it tempered it down a little, but it just spoiled whatever it touched.
As in my last post I was making a referance to not-quite airtight containers, often ones that _appea_r to be airtight but are not, I know that it happens. Some that have been opened and have been attempted to be resealed airtight. Who hasn’t had a tin which although factory sealed, was incorrectly sealed in the factory? Or a container of, I suppose any tobacco product, which was made to be repeatedly opened and resealed. In the worst case it doesn’t hurt to wear a belt and suspenders. 
Of course, better safe than sorry. Snuff is never quite the same when it has dried out, whatever you do to re-hydrate.
I maybe an odd ball but I like how snuff changes when it dries out a little. It’s as if I got to try several varieties in one tin.
Speaking of tins that have a decent seal, last night I checked out a “tin” of Taxi red that I was planning to rehydrate-it was about 5 years old. When I opened it up it was still soft and springy to the touch! Took a couple of pinches and it was still nice! Most of those S.A. snuffs dry out on me so much faster.