Pat Frank, the author of Alas Babylon, also wrote a survival manual about a post-atomic world. The fallout shelter mania of fifty years back produced much discussion about how to survive but Frank’s manual contained the following advice:
“The day may come when a pound of tobacco is worth more than a pound of gold.”
BTW, sure is a lot of talk on FReepers about zombies and how to eliminate them. The two topics are somehow related /s.
Anyway, check out the Vincent Price horror classic “The Last Man on Earth”. Masses of zombie vampires versus the last uninfected human.