I have some experience in canning foods. One piece of advice I can give you is to never by off-brand or cheap quality jars or lids, if you decide to go with the two-piece canning jar lids. Ball or Kerr products are safe and readily available options. The seal is maintained by the gasket on the underside of the disc. The ring keeps the lid in place. Cheap jars and lids may not align properly and fail to seal.
What bothers me about using these jars for tobacco storage is the lack of heat. Canned food is sealed when the pressure + heat pulls the lid in for a tight seal. This is why you may see canned food stored without the ring around it. You don't really need it once the lid is "sucked down" on to the jar.
There is some seal with a "cold" lid placed on a jar but not enough to make me 100% comfortable. It's not how these lids are designed to work. Ball refers to them as "two-piece vacuum packs." The discs cannot be reused for this reason - they lose their ability to seal after being vacuum sealed the first time.
I'm sure I'll get some blowback on this, given that it's the common way people store their tobacco.
The Ball company does state that you can store dried fruit and jerky in canning jars like this, but it also states that you can use plastic storage containers and vacuum packages. (
Ball Blue Book, 37th ed.) This can apply to tobacco as a dry good, in my opinion. Admittedly, I use these jars now because we have lots around. But I think I'm going to move towards the bail top jars. As
@BROBS stated, all bail jars are not created equal. Not all are for food storage.
Edit: Bail jars are also commonly used for storing pickles and other fermented foods.