Coca
Coca grows wild in Plains and Forest biomes, with roughly a 2% chance per chunk to spawn a patch (it will never spawn in a Cold, Hills, or Sparse-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, Coca Seeds can also be bought from a Herbalist Villager for 5-10 emeralds.
Once planted, Coca grows the same as other crops, requiring sun, light and irrigated farmland.
Unlike other crops though, Coca 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 2-6 Coca 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 Cocaine Powder with 1 Dried Coca Leaf.
Fill an empty Syringe with Cocaine Powder and a Water Bucket to get a Cocaine-filled Syringe.
9 Coca Leaves give 3 Dried Coca Leaves.
Coca Tea can be crafted in a Vat, 7 Coca Leaves with 4000mb of Water gives 4000mb of Coca Tea.
