With clever names like Peace of Mind, Girl Scout Cookies, Train Wreck and Tsunami, it's a good bet that the marketers of legal marijuana finished high school. That's less certain for their younger customers. New research shows daily marijuana use before the age of 17 cuts your chances of graduating from high school or getting a college degree by 60 percent.

Now that marijuana is legal for recreational use in Washington and Colorado, and for medical purposes in 19 other states plus the District of Columbia, scientists are able to study the drug more closely. The result is an outpouring of data on marijuana's formerly unknown or underappreciated risks.

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