@newbiesnuffer Rice absorbs moisture quite well and it is inexpensive . It’s a known hack when you get your cell phone wet. Just put it in a bag of rice. I use it in salt shakers and keeps the salt flowing when it swamp ass hot here.
You would have to rap some between two piece of insect screen Place it in the bottom of your snuff container and keep the snuff on top. For larger storage, stick the whole can in a big plastic lidded box, full of rice. :-B
Dry pasta may work too but not as fast.
If you want to add scent to it use dehydrated fruit, like strawberries,banana chips or apple, you could also use dry herbs, flowers or spice even a tea bag [Earl Gray would be nice]. If you don’t have a food dehydrator; All these things can be made in the oven on the lowest setting with the door open. Good luck!