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Merianos says that NNK and nicotine were still detected in homes with voluntary indoor smoking bans, which highlights the persistence of thirdhand smoke pollutants on surfaces in children's homes.

"Nicotine reacts on surfaces to create a particularly nasty set of compounds called nitrosamines, which is where the real concern from thirdhand smoke that is left behind comes from," she said.

Ford said he “certainly did not” approve of the relationship between his daughter and Hagans, which he heard about second- or thirdhand because the woman didn’t tell him about it.

It is an article of faith among data experts and the Census Bureau itself that data obtained directly from people are more reliable than secondhand or thirdhand data from other sources.

The invitation came thirdhand, and the details were murky but intriguing.