The increased risk is smallish, with an odds ratio of 1.31, but the finding was consistent, showed a strong dose-response relationship and statistically significant (95% CI of 1.19 - 1.43). Read about it in "Exposure to Diesel Motor Exhaust and Lung Cancer Risk in a Pooled Analysis from Case-Control Studies in Europe and Canada".
Now I must explain the Subtle Approach. There are three occasions on which we cannot use the Direct Opening, and these we must consider carefully: (1) when our cause is discreditable, that is, when the subject itself alienates the hearer from us; (2) when the hearer has apparently been won over by the previous speakers of the opposition; (3) or when the hearer has become wearied by listening to the previous speakers.
- Cicero "Ad Herennium"
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