A cannabis capsule is a pill containing either cannabis oil or whole bud (flower). Cannabis capsules contain the same cannabinoids as the cannabis you can smoke or eat, including tetrahydrocannabinol (THC) and cannabidiol (CBD), and they’re an alternative way to enjoy the psychoactive and/or medical benefits of marijuana. Many people prefer cannabis capsules over bud and oil that is smoked or eaten, because it’s tasteless and just as effective as other forms. However, it may take longer to feel its effects.