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In the newest study, the researchers measured force expiratory flows (FEFs) at 3 and 12 months of babies born to 252 mothers who smoked. FEF measures the speed with which air can be forced out of the lung. The mothers who smoked were randomized to either receive 500 mg of supplemental vitamin C every day or a placebo in addition to the same prenatal vitamin. They were encouraged throughout their pregnancies to quit smoking. [...]