Of those not confirmed, 9% (65/700) did not complete a test and 13% (88/700) were discordant(9% if we ignore participants who used nicotine replacement therapy or e-cigarettes for cessation). <br><br>Only 1% (30/4172) of participants across all randomization groups reported using nicotine <br>replacement therapy or e-cigarettes for cessation at three months. <br><br>Similar follow-up rates, concordance of self-reported and biochemically verified results, <br><br>and nicotine replacement therapy and e-cigarette use were found at six and 12 months, <br><br>although urine testing rates declined over time.
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