Several states have passed “CBD only” legislation, thinking that this particular strain of Cannabis will treat or cure every illness without that awful “High” from Marijuana. Whether from cowardice, ignorance or genuine concern for the public safety, these legislatures have short changed the people they purport to want to help.
CBD is Cannabidiol, one of the components of Marijuana. It has great anti-seizure and anti-inflamatory properties, among others. It is not a psychoactive component, and, in fact, can be considered the “Anti-high.” For more on Cannabidiol and the human endocannabinoid system, go to: http://norml.org/library/item/introduction-to-the-endocannabinoid-system
There are several strains that are CBD predominant. A good, basic discussion of the strains can be found at: http://www.leafly.com/news/lifestyle/whats-the-deal-with-these-high-cbd-strains
CBD is just one part of the plant. It can do a lot on its own, but it works much better in conjunction with other components of the plant such as THC, THCA, THCV and others. For government to limit medical applications to just one component of Cannabis is to limit the effectiveness of the medicine.