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在吸烟的数量与低出生体重和早产儿发生率以及某些新生儿和产科并发症之间发现了密切的相互关系。在各个种族都存在着这种吸烟量的影响的相互关系。但在黑人更加严重。每天吸香烟20支以上的黑人母亲所生的婴儿体重≤2350克者24％,为不吸烟母亲所生同样体重婴儿的三倍。每天吸烟20支以上黑人母亲所生的早产儿的频率较之不吸烟者增高1.5倍,即自7％增至17％。白种人的相应增长数字,两者都增长一倍,即低出生体重,自45.
A close correlation was found between the number of smokers and low birth weight and the incidence of preterm birth, as well as certain neonatal and obstetric complications. There is an interrelationship between the effects of such smoking on all ethnic groups. But the blacks are worse. Babies born more than 20 black smokers who smoke cigarettes a day, 24% of those weighing <2350 g, are three times as likely to give birth to the same weight babies born to non-smokers. Premature babies born to more than 20 black smokers daily smoke more than 1.5 times as often as non-smokers, from 7% to 17%. The corresponding increase in white numbers, both doubled, that of low birth weight, since 45.