Cannabidiol (CBD) is the natural component of cannabis responsible for the physiologic, medical benefits. There is a minimal psychoactive effect from CBD. Tetrahydrocannabinol (THC) is the component responsible for the psychoactive effects of the ‘buzz,’ ‘head rush’ or ‘high.’ There is a beneficial effect of THC in boosting the power of CBD effect on your condition. The relative amounts of CBD and THC are adjusted in medical marijuana to minimize the amount of THC and maximize the CBD, and the THC can be ordered in a dose that will not affect you psychologically. Your physician controls the strength and dosage, depending on your condition and what makes you feel you are comfortable.