I think a much better solution would be buy roll your own tobacco. You can buy a higher grade than most mainstream brands and it will be much cheaper. Throw in a couple packs of ZigZags and you got a cheaper more efficient solution.
My dad chain smokes, and he was amazed how long you can keep cigarettes in a freezer bag (no vacuum)...
Use the vacuum, suck out all the 'Air' you can get out.
Use your welder and inject Argon, CO2, or what ever DRY & INERT gas you have around,
Then seal up the bag with the heater element.
The idea isn't to have vacuum, but to have the oxygen and moisture sucked out,
Then replaced with dry Inert gas with NO OXYGEN.
I got dad cartons and evacuated the oxygen out and replaced with inert gasses, and they were still 'Fresh' after a year!
(.35 cents a pack off an Indian reservation, but no tax stamp, so don't try this at home kiddies!)
I learned this trick from the jerky companies.
They pack the jerky in all sorts of strange gasses,
The military stores food, bullets, missile parts, ect. the same way.
No oxygen, no corrosion!
You can keep in the bottom of the can from skimming over by doing the same thing in the can,
Replace the oxygen with argon or carbon dioxide and it won't skim over or dry up in the bottom of the can...
As for Loose tobacco vs. rolled cigarettes,
Storage would favor the loose tobacco.
Trade value would favor packs of factory rolled cigarettes.
Cigars and pipe tobacco would both be very good trading material for tobacco addicts...
Cigars and pipes can be put out and re lit again and again with little to now loss, you can't do that with a cigarette...
I believe the trading value would still be with factory rolled, pre-packaged cigarettes...
Now, I don't believe in the 'End Of The World As We Know It' crap,
When I was a kid, my grandpa used to trade with the 'River Rats', Coffee, bacon, smokes, ect.
I don't think I ever had to cut any fire wood after they found out we weren't going to feed them breakfast including coffee and bacon if they didn't contribute to the wood pile, or bring eels, fish, turtles to throw in the frying pan for dinner!
We NEVER wanted for stuff like that at the river, and all it usually took was some bacon, a couple of cups of real coffee and a smoke or two!
Times have changed, and society in general doesn't allow 'River Rats' to mind their own business and sustain themselves on the river anymore...
Everyone has to 'Conform' and be in the 'System' or they are cast as killers, thieves & perverts!
Personally, I'm respectful to everyone, and down right polite to most people I meet down at the river or out in the woods, and it's ALWAYS returned...
(Unless they are wearing brand new cammo and carrying brand new gear!...)