翻译原文：

Teens whose mothers smoked while pregnant with them and are themselves smokers have a harder time paying attention and focusing than their non-smoking peers who were not exposed to smoke in the womb, a US study shows.

The researchers also found gender differences in the effect of nicotine exposure, with exposed girls showing both visual and auditory attention deficits, while the boys only had difficulties in listening.

Nicotine is known to bind to receptors involved brain development and studies have identified both intellectual and auditory problems in smokers' offspring.

Both the prenatal period and adolescence are critical times in brain development and smoking has been linked to memory and attention problems in teens.

To better understand the effects of nicotine exposure on attention, Dr Leslie Jacobsen of the Yale University School of Medicine in New Haven and colleagues had 181 teens perform a series of tests to evaluate how well they grasped visual and auditory cues.

Sixty-three of the teens had brain scans while they took the tests. Among the 92 who had been exposed to cigarette smoking in the womb, 67 were themselves daily smokers.

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