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To the Editor: The presence of nicotine and its metabolite cotinine in the body fluids of nonsmokers is usually taken as evidence of exposure to environmental tobacco smoke. Recently, the Centers for Disease Control and Prevention studied 800 people, both smokers and nonsmokers, all of whom tested positive for urinary cotinine1.There is considerable evidence that nicotine is present in certain human foods, especially plants from the family Solanaceae (such as potatoes, tomatoes, and eggplant). Castro and Monji,2 Sheen,3 and Davis et al.4 have reported on the nicotine content of foods and drinks. We have been able to confirm . . .