Though many of the doubts have already been clarified in other posts, it is important to remind people some of the difference between THC and CBD to avoid confusion about the CBD, its effects on the human body and the misconceptions that many people tend to have about it.
In first place, it is important to clarify that CBD is a cannabinoid present in Cannabis Sativa. Although it is present in Cannabis, it is not marijuana, CBD is a non-psycho tropic component so it does not produce the sensation of ‘being high’, which is generated by THC (Tetrahydrocannabinol), another component plant, this one itself is psychotropic. Likewise, CBD is completely different from medical marijuana, which does contain THC, so it is not a product for recreational purposes.
Actually, curious as it may seem, the CBD has multiple uses, among them is reducing unwanted effects such as anxiety and paranoia caused by the consumption of cannabis with high THC content.
As for the way CBD and THC work in the body, there are big differences. Once the THC is consumed what it does is to adhere to certain receptors present in the body to generate its effects, mainly CB1, this receptors that are responsible for multiple tasks such as coordination, emotions, thoughts, movements, appetite and memories, therefore when people consume marijuana can enter in a state of euphoria and perception is altered.
CBD is said to adhere to CB2 receptors present in the immune system, which directly affect pain and inflammation. That is, both act in different ways in the body and generate completely different reactions.
More info at Huffington Post