Thank you to all the witnesses for being here with us this morning.
I have two questions. They are kind of general, and I hope I have enough time to ask them.
In different parts of the world it's customary to smoke naturally grown cannabis or marijuana. In some parts of the world they smoke opium. In other parts, alcohol is a substance people use. Is there a study that would confirm that in comparison to those who didn't use marijuana, the effects on IQ, effects on learning are prevalent? You know what parts of the world people naturally would use marijuana, and not in other parts. Has anybody ever done a study to confirm there is an effect on IQ, on learning, on the achievements of young people?