The therapeutic benefits of cannabis have been proven by dozens of scientific studies and multiple personal success stories. Cannabis is demonstrating effectiveness in treating everything from Alzheimer’s and arthritis to pain, anxiety and cancerous tumors. The legalization of marijuana for medical purposes has spread across more than half of the country. Concern, however, has been raised that regular and prolonged use of delta-9-tetrahydrocannabinol (THC), the psychoactive ingredient in cannabis, could potentially lead to psychological and cognitive issues. Fortunately, cannabidiol (CBD) is providing a safeguard against the adverse side effects of THC. CBD is a non-psychoactive compound found in cannabis. A recent university study verified that equal proportions of CBD and THC prevented the emergence of all behavioral deficits. Injections of THC were given to a group of adolescent and young adult mice. A second group of mice were given only CBD. A third group of mice received equal dosage of both THC and CBD. The first group showed problems in working memory and increased anxiety. The second group demonstrated no cognitive changes. The third group, those that received the combination of THC and CBD, also showed no signs of cognitive abnormalities. That CBD protects against adverse effects caused by THC is very good news. CBD is found in flowering marijuana and in hemp, and is very abundant. It is a safe, natural, effective medicine and offers successful treatment of neurological disorders. Natural strains of cannabis offer very close ratios of THC and CBD. Over the years, the plant has simply been breed for greater potency, diminishing the amount of CBD. Growers are now concentrating on CBD-rich strains of cannabis.