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Mouth to Gut Bacteria Migration Explains Why Smoking Is Good for Inflamed Bowels

Smoking induces gut metabolites that promote oral bacteria colonization, triggering immune responses that alleviate ulcerative colitis inflammation but worsen Crohn's disease, researchers found.

Summary by Medical Xpress
Researchers led by Hiroshi Ohno at the RIKEN Center for Integrative Medical Sciences (IMS) in Japan have discovered why smoking tobacco helps people suffering from ulcerative colitis, a chronic disease typified by inflammation of the large intestine.

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Medical Xpress broke the news in on Monday, August 25, 2025.
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