Medicinal marijuana has been gaining wider acceptance throughout the United States, but there are still plenty of things we don't understand about the effects of the drug. We may be a step closer on at least one angle, though -- the ability of cannabis to dull pain. Using brain imaging technology, researchers at Oxford University suggest that the drug doesn't actually lessen the intensity of pain that patients are feeling. Instead, it seems to change the perception of the sensation, helping patients find the same amount of pain more tolerable.

Read More