Why smokers gain weight: Average of 15 extra pounds comes from gastrointestinal changes.
Why Do Ex-Smokers Really Gain Weight? (It’s Not Extra Calories.) 
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Aug. 31 2013 8:00 AM

Why Do Ex-Smokers Really Gain Weight? (It’s Not Extra Calories.) 

Writing in PLOS ONE, researchers noted that subjects seemed to gain weight even if their caloric intakes remained the same, but why? 

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