system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do stores not sell cigarettes in smaller quantities than 20 in a pack?
gpt
It's called a loosey. When a store sells you a single cigarette. It used to be fairly popular, but for the most part, laws have passed that have banned the sale of single cigarettes, and you can only sell whole packs now.  You can still find people and stores who sell them if you're in the ghetto.