Even factory sealed packages of Tobacco can grow mold and fungus. I know, I roll my own and have gotten it from the store that way. Rolling my own means I can smoke for 80 cents a pack.
If your not going to use it, but think that tobacco would make a great trade commodity in an TEOTWAWKI situation (and it will, I'm sure) then ditch the packages (but hold onto the tubes) and invest in some tobacco seeds, learn how to grow it, harvest it, and cure it.
While your at it, learn the right tobacco for rolling cigars and cheroots, learn how to make those from scratch.
Knowledge and skill doesn't grow mold.
