Quote Originally Posted by Pugsley View Post
But, I can't help wondering why this only seems to happen with C&D tobacco, and only with burley.
It doesn't only happen to C&D tobacco.

I currently have a vintage tin of Red Rapparre that is bulging pretty badly. I have also had GL Pease canisters do the the same thing. I think the "peel back" topped tins are just more likely to bulge like that. I have never had a square European tin do it before myself, but a I have had a lot of those "peel back" top tins do it.

I wouldn't worry about it myself. Just pop it when you want to smoke it and enjoy that sweet aged flavor