Among parents who did not achieve abstinence , those who received quitline counselling smoked fewer cigarettes at 3-month ( P < 0.001 ) and 12-month assessment ( P < 0.001 ) , were more likely to make a quit attempt ( P < 0.001 ) , to achieve 24 hours ' abstinence ( P < 0.001 ) and to implement a complete home smoking ban ( P < 0.01 ) .