Dunno about stereo-selectively, but you dont really need to understand that to understand that we all use our cannabinoid receptors.

Our bodies create their own cannabinoids (Endogenous Cannabinoids) naturally and those cannabinoids bind to cannabinoid receptors.
Edgar Reviewed by Edgar on . Brain use If we have cannabis receptors in our brains, and only pot-smokers use them, then it's obvious that we use more of our brains than non-pot-smokers. So why don't they listen to us? Rating: 5