Years back it was common to detect the odour of Cannabis when entering Angels and a few other brothels, but as I don't go there anymore and it never seemed to affect the service I had no lingering problems.
A few years back I had an incall from a girl who kept disappearing to the loo every 15 minutes or so. When she returned she would seem "invigorated" and launch into so mind blowing DT.
About the same time when entertaining a younger girl on an incall she pulled out two balloons of cocaine, offered me one - declined and during the hour booking she used both. This one shocked me a lot but I was thinking with the little brain at the time and let it go. Service was not affected and I was satisfied with the sex but I never booked her again, or any of her friends.
None of them are still working so there is no point in naming them.