Via Digg from Physorg.com:
A study by pediatricians at the Liverpool School of Tropical Medicine indicated that parents that smoke during conception will have up to 50% chance of having baby girls because substances in cigarettes such as nicotine inhibit sperms carrying male chromosomes from fertilising eggs. Besides that, chances of miscarriage will increase. Pregnant women exposed to second hand smoke are also less likely to give birth to male infants.
This study was done on 9,000 women who gave birth between 1998 and 2003 at the Liverpool Women's Hospital so this data must have some validity to it.
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