My daughter is 4 and i very rarely smack her in fact i cant remebr the last time i did, but when she was a toddler i gave her the occasional tap on the hand although never enough to hurt her, more to shock her & let her know she was doing something wrong when just telling her off didnt work, i've never smacked her out of anger or frustration though i think thats where the problems come in, i have other successful ways of discipling her so have no need or desire to smack her, although i was smacked occasionally as a child when i did something really wrong, i dont feel any bad towards my mum now, i know how bad i was & she did what she had to do!