While CBD generally comes from the same plant as THC, it will not get you high.
CBD when isolated from the rest of the plant only contains trace amounts of THC (0.03% or less). This isn’t nearly enough to get you high. It is, however, still considered a psychoactive substance. This is an important concept to understand as CBD is often referred to as the non-psychoactive substance in comparison to THC.
The term psychoactive has to do with the alteration of a person’s mental state. A psychoactive substance has an impact on how the brain and central nervous system functions. Substances in this category are often thought of as illicit, although in truth they can be something as non-threatening as caffeine.
While the terminology may be confusing, it is important to understand that psychoactive and intoxicating are two different things. Intoxicating refers to a diminished mental state and physical ability, similar to the effects of THC. Of course, THC is much more benign compared to alcohol and other illicit substances that may negatively impact the brain.
CBD and THC respond differently to the receptors in the brain and body, which is why CBD is often used alternatively to THC.