© 1991 Oxford University Press
research-article |
Factors Determining Exposure to Passive Smoking in Young Adults Living at Home: Quantitative Analysis Using Saliva Cotinine Concentrations

*ICRF Health Behaviour Unit, Institute of Psychiatry 101 Denmark Hill, London SE5 8AF, UK.
**Addiction Research Unit
Poisons Unit, New Cross Hospital London, UK.
Saliva cotinine concentrations were used to examine determinants of exposure to environmental tobacco smoke in 393 non-smoking students (age range 1619 years) attending a sixth form college and living at home. Average concentrations were low (median 0.60 ng/ml), reflecting partly the warm weather at the time of the survey and partly the predominantly middle class sample. Despite this, cotinine levels were strongly related to the extent of self-reported passive smoking in the past three days (medians 0.30, 0.60, 0.90 and 1.35 ng/ml in those reporting None at all, A little, Some and A lot respectively, p<0.0001). Individual sources of environmental tobacco smoke identified were smoking by mothers (p<0.0001), by fathers (p<0.01), and exposure at college (p<0.001) and when out in the evenings (p<0.001). The results indicate that exposure outside the home may become of equal or greater importance than family smoking in determining the overall passive smoking dose received by this age group.
Revised 1 August 1990
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