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Smoking and inflammatory bowel diseases: what in smoking alters the course?

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Abstract

Epidemiological studies provide strong evidence to confirm the correlation between cigarette smoking and inflammatory bowel diseases. This relationship is proved to be positive in Crohn’s disease and negative in ulcerative colitis. What in smoking alters the course of inflammatory bowel diseases is still a mystery. Different smoking parts have different and may be opponent actions. Smoking has dual effects. Some of its activities are, sometimes, constructive as they are working in an antagonistic manner to the mechanism of the disease, such as reducing rectal blood flow and accordingly less recruitments of inflammatory mediators to the area of inflammation, enhancement of mucosal production, and consequently, strengthening the membranes, and inhibition of pro-inflammatory mediators’ liberation and activity in subjects with ulcerative colitis. Yet the outcome of smoking actions may be affected by the existence of other cofactors. Odd factors, such as shortage of zinc in subjects with Crohn’s disease, may facilitate liberation of pro-inflammatory mediators and their activities and accordingly exacerbates symptoms.

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El-Tawil, A.M. Smoking and inflammatory bowel diseases: what in smoking alters the course?. Int J Colorectal Dis 25, 671–680 (2010). https://doi.org/10.1007/s00384-010-0925-6

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