In contrast, ever smoking among women was affected by birth cohort
The relatively low smoking prevalence observed in this study is lower than that reported in some national surveys (17), which may be explained by the younger age distribution and higher educational level of the participants
Lung cancer occurrence in never-smokers: an analysis of 13 cohorts and 22 cancer registry studies
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Average exposure levels during 1941 - 47 were estimated to be below 25 mg/m 3 and, during the 1950s up to 1963, these levels were 10 - 50 mg/m 3 , but peak exposures above the odour threshold (about 1000 mg/m 3 ) were known to occur