From the New York Times, 06/16/19
By Kenneth L. Davis and Mary Jeanne Kreek
Dr. Davis and Dr. Kreek are physicians.
Recent efforts to legalize marijuana in New York and New Jersey have been stalled — but not killed — by disputes over how exactly to divvy up the revenues from marijuana sales and by worries about drugged driving. Those are both important issues. But another concern should be at the center of this debate: the medical implications of legalizing marijuana, particularly for young people.
It’s tempting to think marijuana is a harmless substance that poses no threat to teens and young adults. The medical facts, however, reveal a different reality.
Numerous studies show that marijuana can have a deleterious impact on cognitive development in adolescents, impairing executive function, processing speed, memory, attention span and concentration. The damage is measurable with an I.Q. test. Researchers who tracked subjects from childhood through age 38found a consequential I.Q. decline over the 25-year period among adolescents who consistently used marijuana every week. In addition, studies have shown that substantial adolescent exposure to marijuana may be a predictor of opioid use disorders.