The odds of having successfully quit at 12 months was 4.12 times more likely ( 95 % CI = 1.57 , 10.8 ) for parents who believed that quitting will benefit their children ; 1.68 times more likely ( 95 % CI = 1.13 , 2.51 ) for parents with more than a high school education ; and 1.74 times greater ( 95 % CI = 1.13 , 2.68 ) for parents with children under age 3 years .