Any compound capable of activating the cannabinoid receptor CB1 and/or CB2. Cannabinoids include phytocannabinoids, endocannabinoids and (semi-)synthetic cannabinoids. They exert a wide variety of biological activities including anti-inflammatory, anti-emetic, anticonvulsant, antiglaucoma, analgesic and neuroprotective effects; while some exert psychoactive effects, including euphoria.