“Leep is correct, having goodies like sugar, tobacco, and booze (and instant coffee) is wise “
I would add a bit of salt and some 22 LR shells.
I have grown tobacco pretty plant, never took to smoking or chewing stage. Seeds are very small. If you can get the seedling started (warm climate) then you are good to go.
My grandmother grew her personal tobacco in California, salt and ammunition are good trade items but I think the vices of coffee, booze, and sweeteners are more immediately useful, especially in the more realistic emergencies of weeks to months.
Being able to invite your jonesing neighbors over for a cup of sweet coffee or a few fingers of booze can be really good for communication, relationship building, and information gathering.