I don't know BPP, usable is probably the best you could say. Tobacco contains lots of volatiles which give it it's flavor profile. Kind of like coffee or tea. Wouldn't all that evaporate in 50+ years time? I'm not saying it doesn't have pre-embargo tobacco. I'm just guessing it's a gimmick and that the amount is miniscule, not to mention flavorless and neutral to the flavor profile.