I'm 48 now, and I was smacked A LOT, and by both parents. My DSis and DB were too. (Worse things happened too, but that's not relevant here.) I was aware that other children's parents got far less angry, and DSis and I used to talk about running away sometimes.
My F used to smack us extremely hard. My DM has long since acknowledged that he smacked us too hard, but she put it down to men not knowing their own strength. The last time I remember being smacked was when I was 13, and I've worked out that I was actually pregnant at the time. (It wasn't discovered until I went into labour.)
The worst incident of corporal punishment in our home was when my DM caned my DB. She says that she was haunted by this for years, but I was truly shocked when she told me the reason. I'd assumed it was for some major act of rebellion, but in fact it was because he couldn't do his Maths homework.
It's only in recent years that the scales have come off my eyes and I can see how abusive my parents were.
And yes, I do remember being smacked by teachers in primary school. In year 2, the teacher was a real dragon and smacked us a lot. There was also a cane for the most heinous behaviour, but that hardly ever happened, and only the headteacher could use it.
I don't smack my DDs. They're adopted with attachment issues and when you adopt you have to agree not to smack the child you're adopting. I'm the one suffering violence at the hands of DD1 (now 9), as is DD2 (6). She has a lot of needs, which we're finally getting help for.