From dangerous mushrooms to poison ivy, there's plenty in the natural world that's dangerous to touch or ingest or breathe the fumes of. Natural poisons can add colour to the world. Perhaps there is a similar-looking herb that has healing properties; this can create a tense 'will it heal me or kill me?' conundrum! Perhaps a clever captive could harvest a poisonous root from their captor's gardens to mix a poison! Can the smoke of a particular plant be used for Silver Chair style hypnotism? Plant name: Slang/common name(s): Is it dangerous through ingestion, contact, inhalation or another means? What happens if you are poisoned/affected by it? What common uses does it have? Is there any antidote? Where is this herb found? Is it legal to cultivate?