I'm going through this now, we don't smack our child but I do remember getting smacked when I was especially naughty, and yeah, it set me straight. I don't hate my farther for it or anything, I just understand he had to do something.

My wife is getting basically beat up by one of our kids now, she doesn't believe in smacking so basically she just puts up with it and tries to talk to them about it and uses various strategies. Some work for a while, some don't. Sometimes she blows up anyway, which is completely normal human behavior.

I guess we're running a potentially very high consequence experiment with our children to see if talking through them and using other strategies turns them into better / equivalent humans to us without the smacking, let's see.