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Exhaled carbon monoxide (CO(Exh)) measurement is used to confirm smoking status in smoking cessation programs, but the cut-off level is still a matter for discussion. The objective of this study was to compare CO(Exh) levels in smokers and non-smokers to validate the method in a Brazilian population and to estimate the probability of the patient still smoking according to different cut-off points.

Exhaled carbon monoxide as a marker for evaluating smoking abstinence in a Brazilian population sample