EXPOSURE TO ENVIRONMENTAL TOBACCO SMOKE AND RISK OF ADENOCARCINOMA OF THE LUNG
(International Journal of Cancer, Nov. 26, 1999)
All subjects had smoked fewer than 400 cigarettes in their lifetimes. Ever exposure to ETS from the parents during childhood was associated with a decreased risk [odds ratio (OR) 0.6, 95% confidence interval (CI) 0.3-1.2], and there was a suggestion of a decreasing trend in risk with increasing duration of exposure. Ever exposure to ETS from the spouse was not associated with an increased risk (OR 1.0, 95% CI 0.5-1.8), while the OR of ever exposure to ETS at the workplace was 1.5 (95% CI 0.8-3.0). For both exposure sources, an increased risk was observed among the highly exposed, and the OR among those with the highest duration of exposure to ETS from the spouse or at the workplace was 1.8 (95% CI 0.5-6.2).
A similar risk was estimated for current exposure to ETS from either source. Our results confirm previous reports of a weak effect of adult ETS exposure on risk of adenocarcinoma of the lung. Bias and confounding cannot be excluded as explanations for the apparent decrease in risk from childhood exposure."
CommentaryNote that none of the RRs (including the apparently protective effect of childhood exposure) were statistically significant.
Despite the 'mandatory,' 'politically correct' authors' statement about finding a "weak" risk and lamely trying to explain away the "protective" effect of childhood exposure, the simple fact is that they found no statistically significant association between ETS and lung cancer in the home or in the workplace or in the home AND the workplace.
Adenocarcinoma is the type of lung cancer most frequently found in non-smokers rather than smokers.
(Thanks to Steven Milloy's Junkscience for reporting this as the "study of the day" on December 8th, 1999)