Although they come from the same family of plant, taking a CBD supplement and using marijuana are two totally different things.
Hemp is a cannabis plant which naturally contains less THC and more CBD than the marijuana cannabis plants.
Therefore, when you are using marijuana the compound THC enters your body, this is the part with the psychoactive properties that can make you feel ‘high’.
CBD extract is not the same. It has been made specifically not to contain/contain acceptable levels of THC and doesn’t have the psychoactive effects that pure cannabis does.