One of my F&T tin was doing a little scratchy noise when I used to open and close the lid. I tried to clean it up with a tissue and discovered a significant amount of aluminum dust on the tissue. Same thing when you clean the inside of the lid. Kind of disgusting if this falls off into the snuff.
I checked other tins too and even for those that close rather smoothly they all have a certain amount of aluminum dust that accumulate from the friction generated by closing/opening the lid repeatedly.
What do you think, can that be harmful if this dust gets into your body?