The first cannabinoid scientists ever isolated from the cannabis plant wasn’t THC, and it wasn’t CBD. It was a molecule called cannabinol, or CBN, pulled from a “red oil” extract in 1896, decades before anyone had worked out what made the plant intoxicating. For a while, researchers even assumed CBN was the thing doing it. It wasn’t. Once THC was identified, CBN got filed away as a footnote: the weak, sleepy stuff that forms when THC breaks down with age, light, and heat.