I've often wondered how long an open tin of tobacco will stay fresh. Well, I found out that 2-3 months that I've had my SG Westmorland and Chocolate Flake open is too long. Sigh.... Oh well, I'll rehydrate it and get it in a jar. Lesson learned. I really wanted a bowl of the Westmorland last night. I went with some Plumcake that I had jarred instead.