I heard an interesting article on NPR yesterday morning about how Marijuana may hurt the developing teen brain. Here is the story if you want to listen to it or read it: http://www.npr.org/blogs/health/2014/02/25/282631913/marijuana-may-hurt-the-developing-teen-brain.
The skinny is that the teenage brain gets rid of unused connections to help the brain make judgments, think critically and remember what it has learned. Studies show regular marijuana use changes the structure of the teenage brain – specifically in the areas dealing with memory & problem solving. Also, IQs can drop by EIGHT points!