The combination of the nicotine patch with varenicline was not associated with higher rates of continuous abstinence at 12 weeks ( 39.1 % versus 31.8 % ; odds ratio ( OR ) 1.24 ; 95 % confidence interval ( CI ) 0.8 to 2.6 ) and 24 weeks ( 32.8 % versus 28.2 % ; OR 1.17 ; 95 % CI 0.4 to 1.9 ) .