[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2009/images/05/14/art_marijuanaelsohly_cnn.jpg caption= "Mahmoud ElSohly says marijuana's potency will continue to rise before tailing off in the next five years."] By Jeanne Meserve and Mike M. Ahlers OXFORD, Mississippi (CNN) – The average potency of marijuana, which has risen steadily for three decades, has exceeded 10 percent for the first time, the U.S. government … Continue reading Marijuana potency surpasses 10 percent, U.S. says