Smoking

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Smoking too much tobacco is also irritant to the digestive tract and increases the metabolic requirements of Vitamins C, all else being equal, by at least 30 mg per cigarette over and above the typical requirements of a non-smoker. Vitamin C which is normally present in such foods as lemons, oranges and capsicums, oxidizes rapidly once these fruits are cut,juiced, cooked or stored in direct sunlight or near heat. Vitamin C is important to the immune function.