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Renal arterial fibromuscular dysplasia (FMD) is a significant cause of renovascular hypertension, especially in younger females. Tobacco constituents have been shown to stimulate proliferation and synthetic activity of cultured human vascular smooth muscle cells. We examined the relationship between smoking and severity of FMD in a group of 50 subjects with the multifocal form of renal arterial FMD. A detailed smoking history was obtained by interview, clinical data at diagnosis of FMD were obtained from medical records, and angiograms were reviewed. Clinical and angiographic features were compared between smokers and non-smokers. Twenty-four sub-