According to a recent report filed by the World Health Organization's (WHO) Expert Committee on Drug Dependents the use of naturally occurring CBD, found in cannabis, is well tolerated by the body and not associated with any potential health risks.
In addition the authors of this report also admit that CBD "exhibits no effects indicative of any abuse or dependence potential". This can likely be attributed to the fact that while CBD offers the potential of relief from various ailments it does activate the CB1 or CB2 receptors thus producing no psychoactive effects.
The WHO also addresses CBD's medicinal effects, stating that "CBD has been demonstrated as an effective treatment of epilepsy in several clinical trials" as well as saying that there is preliminary evidence that CBD may be useful in treatment for a number of other medical conditions.
While the WHO acknowledges the unsanctioned medical use of CBD in various products as well as highly concentrated extracts available online and in many stores across the US, CBD is generally "well tolerated with a good safety profile". Any reported adverse effects may be a result of drug-drug interactions between the CBD and the patients' current medications.