Still Another Study Saying What We Already Knew about the "Gateway Drug"...

"Recent research from the authors of the study, Didier Jutras-Aswad of the University of Montreal and Dr. Yasmin Hurd of New York’s Icahn School of Medicine at Mount Sinai in New York City released a statement:

“…the long-term impact of adolescent cannabis exposure on brain and behavior, the current evidence suggests that it has a far-reaching influence on adult addictive behavior, particularly for certain subsets of vulnerable individuals.”

"According to the research marijuana interacts with the brain of teenagers through chemical receptors situated in the areas responsible for
•Learning and management of rewards
•Motivated behavior
•Decision making
•Habit formation
•Motor function.

"Since the brain changes quickly..."
http://www.examiner.com/article/marijuana-affecting-the-brains-and-mental-health-of-teenagers