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Conclusions: The results do not support a causal
relation between environmental tobacco smoke and
tobacco related mortality, although they do not rule
out a small effect. The association between exposure
to environmental tobacco smoke and coronary heart
disease and lung cancer may be considerably weaker
than generally believed.
Translation: There is some effect that may be (studies will differ in results based on sample, methods, etc. and that's why we have tons of studies on a continual basis) weaker than previously concluded. But only fools will assume there's a substantive difference between stronger and weaker. Those are subjective categories in practice, even when numbers are reported.
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