Hafdonga, I don't think DD would have mentioned the problems (which came up in passing at the point when she was seriously sleep deprived and struggling) if she were partaking. Which does not mean she won't in the future, and I assume now things are easier I will get less detail of her life anyway.
I think she was quite shocked, but that may be because in a city centre school they split themselves off into tribes quite early. There were some, "the safe set", who went to clubs and parties, whilst the others tended to gather in each other's houses to watch films or play computer games, or have picnics in parks. Drugs were around, but more heard about than seen.
University has meant that they are thrown rather randomly together, so what seems like normal behaviour to some, is shocking, or annoying, to others. Presumably for second year they will separate out influenced by lifestyle. Already DD is finding that she cant join the full post-match social life because she has an early start next day.
The date rape drug stuff is shocking. Even Parliament! DD is aware of an incident at her University which apparently resulted in (at least) an expulsion. A friend who has several daughters, was able to list six incidents involving people her daughters knew, both in London and at different Universities. Her savvy sixth former and friends are very alert to this and guard their drinks carefully.