IARC has determined that there is strong evidence that formaldehyde is the cause of nasopharyngeal cancer and moderate evidence that it causes leukemia, especially of the myeloid variety. Here's the ungated table from "A review of human carcinogens - Part F: Chemical agents and related occupations".
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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