Can smoking negatively affect one's ability to become pregnant? A study collected data on 654 women who had gone off birth control with the intention of becoming pregnant. Smokers were defined as those who smoked at least one cigarette a day prior to becoming pregnant. The results of the study are summarised in the table below. Smoker Non-smoker Total Pregnant 27 195 222 Not pregnant 100 332 432 Total 127 527 654

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