But it's still not a good idea, obviously.
Both the abstract and full text of the article are available.
Smoking during pregnancy presents health risks for both the mother and her child. In this study we followed changes in the production of steroid hormones in pregnant smokers. We found significantly higher levels of testosterone in newborn males of smokers and higher levels of 7alpha-OH-DHEA in female newborns of smokers. Smoking during pregnancy induces changes in the production of steroids in both the mother and her child. These changes are different for different fetal sexes, with more pronounced changes in mothers carrying male newborns as well as in the newborn males themselves.
Both the abstract and full text of the article are available.