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Human Reproduction, Vol 12, 1391-1392, Copyright © 1997 by Oxford University Press

ARTICLES

An hypothesis on the association between maternal smoking and dizygotic twinning

WH James
The Galton Laboratory, University College London, UK.

There is good evidence that smoking is a marker for high steroid hormone concentrations (at least at the time that smoking is initiated). This would explain the finding that smoking is associated with dizygotic, though not monozygotic, twinning. The notion that smoking and other elective behaviours (e.g. drinking alcohol, opting for vasectomy and use of oral contraception) are markers or indices of high hormone concentrations may have widespread repercussions for cross- sectional epidemiological studies of such risk factors for diseases thought to be partially caused by high (e.g. prostatic and breast cancers) or low (e.g. rheumatoid arthritis) concentrations of these hormones.
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This article has been cited by other articles:


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