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Eventually, the lining of the GI tract can take on a "cobblestone" appearance, as tissue becomes so crowded with ulcers that it resembles a cobblestone sidewalk

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E-cigarettes can help people quit smoking but may be gateway for non-smokers, studies suggest Wed 19 Aug 2015 at 4:13pm , updated Sat 10 Oct 2015 at 12:33pm Vaping might help smokers butt out, but it could also encourage non-smokers to light up, two new conflicting studies reveal

Editors Note: For more than two decades researchers have studied pets and secondhand smoke effects