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Smokers are less likely to conceive boys
The natural birth rate in Europe and North America favors men, with a number of approximately 105 boys for every 100 girls.
Recent studies prove that boys are less likely to be born by couples smoking cigarettes. The chance of having a boy is smaller when the man smokes and falls even more when the expectant mother reaches for cigarettes.
Dr Misao Fukuda from Japan and colleagues from the University of Copenhagen in Denmark analyzed cases 11,800 babies and established smoking habits for parents. Each mother and father was asked about the number of cigarettes smoked in the period preceding fertilization. The researchers calculated the ratio of births of girls to boys in three groups. The first group were men and women who did not smoke. The second, those who smoked up to 20 cigarettes a day and the third - those who smoked more than 20 cigarettes a day. It turned out that the ratio of births of boys to girls decreased along with the number of cigarettes smoked.
In the first group, in which none of the parents smoked, 121 boys were born for every 100 girls. When both parents smoked more than 20 cigarettes a day, the number of boys per 100 girls dropped to 82. If the mother was a non-smoker, but the father smoked more than 20 cigarettes a day, the rate was 98 boys per 100 girls. And when the mother was a heavy smoker, but the father did not smoke, the number of boys fell to 87.
The results were published in The Lancet.
As a side note, it is worth noting that regardless of the results of the research - it is recommended to quit smoking during the period of applying for a child. In addition, tobacco reduces fertility, which can effectively prevent a couple from getting pregnant.