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More recent data from Spain 6 reveal that of 29.7% pregnant smokers, 41.4% spontaneously quit in the first trimester while 58.6% continued to smoke

Retrieved 9 December 2025

According to the studys authors, the cotinine urine test provided high sensitivity and specificity for smoking in at least the previous 72 hours

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For those who do not smoke, many do not have a choice when being exposed to secondhand smoke and the more than 7,000 chemicals found in tobacco smoke, including about 70 known to cause cancer according to the Centers for Disease Control and Prevention (CDC)