cigarette smoking survey questions Origin and use of the 100 criterion in tobacco surveys Barriers to quitting smoking. Original

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Participants were classified into five mutually exclusive groups: never users (n = 11,760), former smokers (n = 6,201), current cigarette smoking only (n = 2,747), current e-cigarette use only (n = 907), and current dual use (n = 572)

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An analysis of potential factors accounting for the differences found that highly ventilated cigarettes tended to produce lower levels of both gas- and particulate-phase free radicals

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