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[3] Epidemiology [edit] The prevalence of oral leukoplakia varies around the world, but generally speaking it is not an uncommon condition

Research from a number of countries has indicated that the percentage of smokers consuming tobacco from a duty free source ranges from below 1% in the US, Canada and Australia, and up to 3.8% and 5.6% in New Zealand and the UK, respectively [79]

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Lancet (2011) 377:13946.10.1016/S0140-6736(10)61388-8 21 UenoAJijonHTravesSChanRFordKBeckPLet alOpposing effects of smoking in ulcerative colitis and Crohns disease may be explained by differential effects on dendritic cells