Cannabis is a drug that's been part of society for a long time, but hasn't quite reached public acknowledgement yet. The plant grows in warm climates.
When high on cannabis, you feel very relaxed. And hungry. Your senses seem to intensify, and you have thoughts that seem genius at first, but pretty idiotic in hindsight. Kids, don't smoke cannabis before battling the Ender Dragon!
You can also find the plant around the world.