Obama Flashed a Smile After Being Offered a Hit of Legal Marijuana

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An admitted pot smoker, President Obama couldn't help flashing a smile after being offered a hit of marijuana during a visit to a bar in Denver. Colorado is one of the two U.S. states (Washington being the other) that now allow recreational pot smoking under state law.

Gif of the Day: Smoker's Lungs vs. Non-Smoker's Lungs

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Gif of the Day: Smoker's Lungs vs. Non-Smoker's Lungs View Fullscreen
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Here is an amazing gif of two sets of lungs being filled with air. One pair was that of a smoker and the other was that of a non-smoker. Can you guess which is which?