Put a hamster in the jar. If it dies, it's air tight.
Those jars have seals on them, and should take as the tobacco uses up the air just like it does in a mason jar. Just go with it. Canning jars are really just made to withstand heavy pressures used in the canning process, and to be used over and over.
On a Mason jar, screwing the ring tighter doesn't clamp the lid on tighter, whereas on those jars it does. I grant my seal of approval, and I even suggest that they may be far superior to those redneck looking canning jars we all use. I would just get new lids when refilling the washed jars, and only open them when you commit to smoking the jar.
Screw the naysayers. They are merely parroting something they've heard over and over on here.