At the end of last year, there was a supplement about Hepatitis C in one of the national broadsheets. An ad on the back warned drug users about the dangers of "sharing notes" when snorting coke.
Perhaps I'm being naive, but I would have thought that if you can afford to powder your nose through an Ayrton Senna, you're probably wealthy enough not to have to share with somebody else. Unless perhaps you went to a particularly upmarket media party and everyone was taking their charlie through fifties.
"Sorry mate, but I've only got a twenty on me. Can I share yours?"