Medford, Ore. -- Some medical experts say the move to legalize marijuana is giving teens a false sense that marijuana is safe.
Doctors says the brain isn't fully developed until about 26 years old and smoking marijuana can have an impact on the development of the brain.
The "Oregon Healthy Kids survey" from 2013 showed that 20 point 9 percent of 11th graders used marijuana.
Several studies indicate teen marijuana use is on the rise.
Doctors say brain imaging studies of young pot users show significant flaws in the brain's grey matter which is linked to intelligence "It has been found to lower I.Q. points as much as 8, which is a fair amount of I.Q. points your loosing, so in terms of learning, and developing, yes marijuana can definitely slow that development." said Dr. Robin Miller, NBC 5's Medical Expert.
Marijuana use has also been associated with poor attention, memory, and addiction.
Dr. Miller says more research is needed to develop improved prevention strategies and interventions.
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