Unraveling the Paradox: Why Smoking Benefits Ulcerative Colitis but Worsens Crohn’s Disease

MedXY Editorial Team•Oct 6, 2025•Gastroenterology

Smoking increases beneficial short-chain fatty acids like acetate and butyrate in UC patients, enhancing intestinal barrier integrity and anti-inflammatory effects.
Smoking promotes colonization of oral bacteria, notably Streptococcus mitis, in the colonic mucosa of UC patients but triggers adverse immune responses in CD.
In murine models, S. mitis colonization attenuates inflammation in UC but exacerbates disease in CD, partly via modulation of T helper 1 and CD8+ interferon-gamma producing T cells.
Hydroquinone, an aromatic compound from cigarette smoke, facilitates oral bacterial colonization and could serve as a therapeutic mimic to harness smoking’s benefits without harmful effects.

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This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.

Smoking increases beneficial short-chain fatty acids like acetate and butyrate in UC patients, enhancing intestinal barrier integrity and anti-inflammatory effects.
Smoking promotes colonization of oral bacteria, notably Streptococcus mitis, in the colonic mucosa of UC patients but triggers adverse immune responses in CD.
In murine models, S. mitis colonization attenuates inflammation in UC but exacerbates disease in CD, partly via modulation of T helper 1 and CD8+ interferon-gamma producing T cells.
Hydroquinone, an aromatic compound from cigarette smoke, facilitates oral bacterial colonization and could serve as a therapeutic mimic to harness smoking’s benefits without harmful effects.