Exposure to cigarette smoking and children's growth.

An analysis of data from 5903 children from a study of primary schools in England and Scotland in 1982 showed that the number of cigarettes smoked by the parents at home was significantly associated with the attained height of their children. This relation was statistically significant after allowing for parents' height, child's birthweight, mother's smoking during pregnancy, overcrowding and number of older siblings. Number of cigarettes smoked at home was more strongly related to height than number of cigarettes smoked by the mother during pregnancy. The results suggest that passive smoking may have an effect on the height of a child independent of genetic factors, the social environment and mother's smoking in pregnancy. Whether this is a direct effect of parents' smoking on the child's growth remains unclear.