You decide to plant a variety of strange and wonderful rare seedlings in order to grow your own Herbal cigarette.
Henbane, Salvia, and Fly Agaric mushrooms are deceptively easy to grow when you've got a good head on your shoulders, and they're all available through the local seed-swap email group. You trade some dirt to the Chief of Police for the mushroom spores and salvia, and a local church lets you take a cutting of its mighty henbane plant after you buy several Bibles.