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A new study finds that heavy marijuana use by adults could have long-term effects on the brain. What kinds of effects? WSJ’s Jason Bellini has #TheShortAnswer. Subscribe to the WSJ channel here: http://bit.ly/14Q81Xy Visit the WSJ channel for more video: https://www.youtube.com/wsjdigitalnetwork More from the Wall Street Journal: Visit WSJ.com: http://online.wsj.com/home-page Follow WSJ on Facebook: http://www.facebook.com/wsjlive
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