Intraindividual and interindividual differences in metabolites of the tobacco-specific lung carcinogen 4-(methylnitro-samino)-1-(3-pyridyl)-1-butanone (NNK) in smokers' urine
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We want to learn if dual users dependence levels differ from each other and also from exclusive e-cigarette or cigarette users. Perhaps most critically, the same PATH participants will be surveyed on an ongoing basis, and the results of future waves of data may show if experimental e-cigarette users eventually are converted to regular cigarette users
