Via The Dish:

As Roger Nicoll, a neuroscientist at UCSF, puts it: “The brain makes its own marijuana.” Smoking a joint just helps you make more of it.) While these cannabinoid receptors have been targeted for the treatment of a wide variety of ailments and disorders, from obesity to chronic pain, I think they might hold the most promise for the treatment of anxiety. There's now good evidence that mice lacking a normal cannabinoid receptor have difficulty forgetting or unlearning fearful memories.

Which is a roundabout way of saying what everybody knows: pot makes you forgetful. But now it's a feature, not a bug. Awesome!