Cannabis
Cannabis grows wild in Plains and Forest biomes, with roughly a 4% chance per chunk to spawn a patch (it will never spawn in a Cold or Hills-type biome). Each patch is a cluster of already fully-grown plants scattered around a point, and will only take root on grass.
Crop generation can be toggled off via the Config, so if you can't find any, it may be disabled.
If you don't want to search for it, Cannabis Seeds can also be bought from a Herbalist Villager for 2-8 emeralds.
Once planted, Cannabis grows the same as other crops, requiring sun, light and irrigated farmland.
Unlike other crops though, Cannabis keeps growing once it hits full maturity, it will start a new segment above it, up to three high.
Only fully-grown segments drop anything worth harvesting - each one yields 0-2 Cannabis Buds and 2-5 Cannabis Leaves when broken. The bottom segment always drops a seed so you can replant, but upper segments only have a 50% chance to drop a seed, and only once they're fully grown.
Craft a Joint with 2 Paper and 1 Dried Cannabis Bud.
Craft a Blunt with 3 Dried Tobacco, 3 Dried Cannabis Buds and 3 Paper.
Craft a Hash Muffin with 6 Dried Cannabis Leaves, 2 Wheat and 1 Cocoa Bean.
9 Cannabis Leaves give 3 Dried Cannabis Leaves.
9 Cannabis Buds give 3 Dried Cannabis Buds.
Cannabis Tea can be crafted in a Vat, 7 Cannabis Leaves with 4000mb of Water gives 4000mb of Cannabis Tea.
