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The changes could be due to cancer, a precancerous condition called dysplasia, or they could be harmless

Dose-response relationship between O 6 -methylguanine formation in Clara cells and induction of pulmonary neoplasia in the rat by 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone

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I think that kind of makes [students] ask themselves, Oh, what is this

But in the long term, it has the opposite effect: It can have a profound impact on the structure, function and connections in the young brain, which may harm their ability to pay attention, learn and remember things

The FDA says yes, but only in regard to the risk of lung cancer