I've managed to put away quite a few bulk blends and blending components in mason jars for slow and gentle aging. I know I'm not alone in this habit/obsession. Have others found that mason jars will self-seal after a time? Around this forum and other places on the internet, it's been said that once the available oxygen in the jar gets used up, anaerobic fermentation starts to take place. (At least, I think that's the science behind this.) Similarly, I've had reused food jars seal up pretty well, to the point where it takes some muscle to unscrew the lid. And this has even happened with heavy Oriental/Latakia blends like Balkan Supreme (not just Virginia forward blends).
Of course, I assume that not only is this expected, but demonstrates good signs of tobacco properly aging. I have discovered this when going to smell the contents or potentially smoke the contents, but when, after unscrewing the ring, I discover that the lid feels sealed, I have decided to leave it undisturbed. I figure why mess with a good thing until I (and the tobacco) are good and ready.
Of course, I assume that not only is this expected, but demonstrates good signs of tobacco properly aging. I have discovered this when going to smell the contents or potentially smoke the contents, but when, after unscrewing the ring, I discover that the lid feels sealed, I have decided to leave it undisturbed. I figure why mess with a good thing until I (and the tobacco) are good and ready.