Anybody know how long a sealed tin of tobacco is good for? I've heard of guys cracking open 70 year old tins of tobacco and smoking them. Is that safe? How old is too old? I would expect that tobacco that has been sealed by modern techniques would probably stay good a very long time, I mean it sits in canisters in tobacco shops for quite a while. So anybody smoke older tobaccos sealed up in "collector tins" and if so what has your experience been.