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Letters to the Editor |

In Utero Smoking Exposure Warrants Further Investigation

Ardesheer Talati, PhD; Myrna M. Weissman, PhD
Arch Gen Psychiatry. 2010;67(10):1094. doi:10.1001/archgenpsychiatry.2010.119.
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D’Onofrio et al1 present data from a large Swedish population-based study testing the association between fetal exposure to maternal smoking during pregnancy and later offspring criminality, using unexposed siblings as controls. Their results suggest that the observed association between nicotine exposure and offspring criminality is accounted for by differences in familial background factors rather than the exposure per se. These observations should not, however, be interpreted as negating the numerous studies that have shown long-term adverse effects of prenatal nicotine exposure. First, in utero exposure to smoking has been associated with a range of problems, from complications during pregnancy and low birth weight, to conduct and other behavioral problems in childhood and adolescence, and ultimately drug and alcohol use and addiction. Only a small percentage of these offspring, however, commit crimes and by focusing solely on incarceration as an outcome, D’Onofrio et al may have been examining a different subgroup. It is unclear whether they would have found similar effects in the same cohort had they examined other psychiatric, behavioral, or developmental outcomes. D’Onofrio et al also note that the observed effects may be driven by unmeasured parental psychopathology. Yet, a number of groups who have directly assessed the parental psychiatric state have found that offspring outcomes are not confounded by parental diagnostic variables or by maternal postnatal smoking.2,3 Finally, there is a body of animal literature,47 now being supplemented with human imaging,8,9 that documents physiological and behavioral abnormalities resulting from in utero nicotine exposure and that cannot be fully attributed to familial background effects.

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