In 1969, I went to Cambridge University for an interview, and met my friend who'd just gone up. In general conversation, he told me that a third of the undergraduates at his college were Old Etonians, and that they were (a) a tight clique and (b) well into cocaine parties. This, at a time when I'd only recently heard of "pot", which for me conjured up the mental image of a Marmite jar.
That's 40 years ago now, just about. Eton was criticised a few years ago for taking a tough line on drugs. Wrong issue: their critics should have asked them just how long the problem had existed. What was going on in the study and the common room? Just don't ask Dave.