Cannabidiol or CBD is the generic name for the medicinal oils from Cannabis. Lately, all of the states in the US have approved the medical uses of cannabis while some states have approved it's recreational use.
While cannabis oil extracts could contain the hallucinogen component tetrahydrocannabinol or THC, this could be removed leaving no traces. Hence, CBDs without THCs do not have the hallucinating effects on users.
While many have claimed that CBDs are miracle natural cures for many medical conditions that include epilepsy, PTSD, anxiety, insomnia, etc it's medical applications could be improved with the use of nanotechnology.