Star Trek: The Original Series, season 1, episode 24
This Side of Paradise
Summary
Despite exposure to fatal radiation, the Federation colony on Omicron Ceti III appears to be thriving. A landing party from the Enterprise investigates, finding the colony's population to be healthy beyond explanation. Leila Kalomi, an old friend of Mr. Spock's, shows the landing party strange flowers that seem to impose a state of pure bliss and perfect health on all exposed to its spores (even Spock), but at the cost of ambition and self-discipline.
Summary from Wikipedia, CC BY-SA 4.0.
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