In a multivariate model controlled for covariates , participants in the extended and maintenance treatment arms reported significantly greater abstinence rates at 24 weeks compared with participants in the standard treatment arm ( odds ratio [ OR ] , 1.70 [ 95 % CI , 1.03-2 .81 ] ; P = .04 ) , had a longer duration of abstinence until relapse ( = 21.30 [ 95 % CI , 10.30-32 .25 ] ; P < .001 ) , reported smoking fewer cigarettes per day if not abstinent ( mean [ SD ] , 5.8 [ 5.3 ] vs 6.4 [ 5.1 ] cigarettes per day ; = 0.43 [ 95 % CI , 0.06-0 .82 ] ; P = .02 ) , and reported more abstinent days ( mean [ SD ] , 80.5 [ 38.1 ] vs 68.2 [ 43.7 ] days ; OR , 1.55 [ 95 % CI , 1.06-2 .26 ] ; P = .02 ) .