Participants will be classified as abstinent if they respond no to both of the following questions: (i) have you smoked any cigarettes (even a puff) in the last 7 days? and (ii) Have you used any tobacco product (i.e., chew, snuff, pipe, cigar, etc.) in the last 7 days? Self-report will be biochemically confirmed with expired CO at each in-person visit and urinary anabasine at week 13
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La transparencia en trminos y condiciones, as como la disponibilidad de historial de transacciones y de avance en los retos, ayudan a que la relacin con la plataforma se mantenga confiable en el tiempo
Abstract: Chronic obstructive pulmonary disease (COPD) is a devastating lung disease for which cigarette smoking is the main risk factor
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