Aleria, one of the last cities on Earth. Ruined buildings, high crime rate, and no sense in any of the people here...
But it is the only sense of safety people can feel in this post-nuclear fallout world. You aren't strong, nor are you good with a gun... but you're smart, and so you do one of the only jobs left for people with brains over brawn. You're a chemist.
Drugs are a hot commodity in the wasteland, not just for pleasure, but for power. Drugs to heal wounds, to give strength beyond normal, a drug for every occasion. You don't care about what you make or who buys it for most of your merch... but there is one exception.
The Hunger Pill. Every wastelander has heard about vault 88 and their terrible drug that got them all eaten. A pill so powerful it allows a human to even consume the radioactive beasts of the wilds whole, let alone other humans.
You sell the pill here, but you do so with great care, as man-eaters are the most dangerous thing in this world...