Smoking damages men's sperm and also the numbers of germ and somatic cells in developing embryos

Two new studies have shed more light on how smoking may damage fertility, and give further weight to advice that mothers and fathers-to-be should stop smoking before attempting to conceive. The first shows that a mother's smoking reduces the numbers of germ and somatic cells in the testes of developing embryos; the second study shows that men's smoking affects the levels of two proteins, protamines, that are crucial for the correct formation of their sperm.

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