About a year ago, I finally got ahold of a can of Grand Prix. I knew about Snus AB and I quickly saw they had no expiration dates. What I didn't know at the time was that Grand Prix was fermented, not steam pasteurized. I do know that I became ill after using three of the tasteless dried out portions.
According to NAS, Nordic Ice Snus has a 12 month shelf life and is rotated by UTSM every 6 months. I asked NAS how UTSM Reps knew when to pull the product if it didn't have expiration dates. I was told there was a special code on the cans indicating age. I have studied the Nordic Ice cans very keenly, and unless you need special glasses or black light to see the code, there is no unique code on the cans. Just the UPC code and Swisher's
tobacco license number.
Expired steam pasteurized snus will begin to deteriorate in taste and nicotine content. Even if you froze it (you can with Swedish/Scandinavian snus for one year), starting around 14 months the nicotine will begin breaking down and the flavor will change. The TSNA levels will still be still be what they were when they rolled out of the factory, though.