Vaping Cannabis doubles among teenagers in last seven years, with potentially harmful consequences, study says.

The study, published by JAMA Pediatrics, analyzed 17 studies conducted throughout Canada and the U.S that involved nearly 200,000 adolescents. The study found that teens in their senior year of high school were most likely to be vaping marijuana compared to younger adolescents. The CDC stated, "The teen brain is actively developing and often will not be fully developed until the mid 20s," adding that use during that time "can have permanent effects" such as poor coordination and damage to learning, memory, problem solving skills, and the ability to pay attention.

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