I went to collect DS from an after school detention today. He usually comes home on the school bus.
I arrive 20 mins early, pull up outside the school and notice a group of boys and girls hanging around the main gates, some of whom are smoking.
I am

It was about 4pm, a time I imagine teachers to be leaving the school. (Some cars did leave while I was there, but I've no idea who was in them)
Then this group wandered off, and three girls came out of school, sat on the grass verge and lit up. 
Now, call me old...but in my day even the hardest pupils would not have dared smoke out side the school gates in school uniform. And we didn't have regular school detentions or the cane (I'm not that old) but we would have been in serious trouble ie our parents would have been informed.
Obviously none of these students were in 6th form, as they were all in uniform. I am going to bring this up with the school, as I think it's not on....just wanted to check 6how^ unreasonable I'm being first.
For what it's worth, I really don't think it makes any difference what type of school it is, apart from it takes pupils from 11 - 18.