If I did something really seriously bad, then yeah i'd get a smack. And to be honest, I agree with that. What a lot of people don't realise, is smacking your children isn't about the pain it causes them, it's about the shock it causes them. It makes a child stop and think "hang on, I REALLY have done something wrong here, that's why this is happening".
Now what I do NOT agree with is smacking your child with the sole intent of causing pain, because
1) That's morally wrong.
2) It won't work, because all you're doing is making them hate you for it.
3) If they can endure pain at all (ie if you do it too often), they ill no longer find it all that bad.
It should be a LAST resort, saved for when your child has done something REALLY bad, where you think the only way to get them to see that is to shock it into them. If your parents are usually really nice to you, and you do something to make them physically hurt you, you're going to KNOW that there's a reason for that.
And yeah no-one's going to read this since it's on the 10th page -_-