Marijuana Slackers 20160823

A marijuana plant grows at a Minnesota Medical Solutions greenhouse in Otsego, Minn., in this May 5, 2015, file photo. Apparent laziness caused by the main psychoactive ingredient in marijuana persists even when the same amount of pot's medicinal component is added, a new study suggests. THE CANADIAN PRESS/AP-Glen Stubbe/Star Tribune via AP, File

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