teens and tobacco use Teen e-cig users more likely to smoke Tobacco product use among middle,

An index is a kind of target document, which functions by providing access to information in or about some source documents in two ways: by deriving symbols from the source documents, or by assigning symbols about the source documents, thereby providing users access from a known order of symbols (e.g., A-Z) to an unknown place of information (Hjrland 2018)

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Acrylamide in foods: A review of the science and future considerations

They suggest that one explanation may be that e-cigarettes are used differently in a controlled clinical trial than in the real world, where e-cigarettes are readily available consumer products without clear instructions for use