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Though the main psychoactive chemical compound in cannabis is tetrahydrocannabinol (THC), the plant is known to contain about sixty cannabinoids, including two others of particularly high concentration, cannabinol (CBN) and cannabidiol (CBD). Differences in the chemical composition of cannabis varieties can produce substantially different effects in humans, and the complexity of the composition of the plant is one reason why its effects can differ significantly from those of synthetic THC, like the synthetic version dronabinol, marketed under the brandname Marinol as an appetite stimulant and ocular pressure-reducing agent. THC is associated with an energetic, cerebral high, while CBD is associated with a relaxed, more drowsy high. CBN is less understood, but high concentrations may have hallucinogenic effects.
-- Marijuana.com
sativas and indicas both carry different amounts of CBN's and CBD's which can make you lethargic (narcotic effect) to a hyper (speedy) effect. Either or, depends on what you're smoking.
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