Wrist, Hand & Finger Pain Causes. If you have pain the hand, understand potential causes of hand or wrist pain including arthritis, injury or other conditions. Read More >>. If you have wrist and hand pain, learn what steps your doctor may take to provide you with a diagnosis of arthritis or other condition.
Marijuana also affects brain development. When people begin using marijuana as teenagers, the drug may reduce thinking, memory, and learning functions and affect how the brain builds connections between the areas necessary for these functions.
While this latest study examines marijuana's effect on physical brain tissue, a Duke University study earlier this year examined the drug's effect on intelligence and performance. That study found that teens who routinely smoke marijuana before turning 18 risk a long-term drop in their IQ.