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How does marijuana affect the brain? Psychological researchers examine impact on different age groups over time More than one third of U.S. teens have used at least one substance by age 16, according to a new study led by researchers at the University of California San Diego that found Are synthetic cannabinoids more harmful than grown cannabis? Alcohol and Drug Foundation Cannabis: Risks and effects Poison Control Does Smoking Weed Cause Lung Cancer? How does cannabis affect the body? National Geographic
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