Early exposure to tobacco as a cause of behavioral problems in children

http://www.eurekalert.org/pub_releases/2015-09/ind-eet092815.php

Public Release: 28-Sep-2015
Early exposure to tobacco as a cause of behavioral problems in children
INSERM (Institut national de la santé et de la recherche médicale)

Researchers from Inserm and Pierre and Marie Curie University (UPMC), in collaboration with the university hospitals of 6 French cities, have analysed data on pre- and postnatal exposure to tobacco in the homes of 5,200 primary school children. They show that this exposure is associated with a risk of behavioural disorders in children, particularly emotional and conduct disorders. The association is stronger when exposure takes place both during pregnancy and after birth. These data show the risk associated with smoking in early life and its behavioural repercussions when the child is of school-going age.These results are published in the journal PLOS ONE.

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In greater detail, emotional disorders are associated with exposure to ETS during both the prenatal and postnatal periods, which concerns 21% of the children in the study. Conduct disorders are also associated with ETS exposure in these children. The association also exists in cases of prenatal or postnatal exposure alone, but is less pronounced.

These observations seem to confirm those carried out in animals, i.e. that the nicotine contained in tobacco smoke may have a neurotoxic effect on the brain. During pregnancy, nicotine in tobacco smoke stimulates acetylcholine receptors, and causes structural changes in the brain. In the first months of life, exposure to tobacco smoke generates a protein imbalance that leads to altered neuronal growth.

"Our data indicate that passive smoking, in addition to the well-known effects on health, should also be avoided because of the behavioural disorders it may cause in children," concludes the researcher.