coke, speed, and a few decades later e's/ mdma , have been part of club culture since at least the 60s, generally the use of chemical assistance is to prolong and perhaps enhance the night out ( often allnighters)
as a young 67 year old Im more than aware of whats been going on over the decades, having been a successful Dj , and for 15 years reasonably successful live music promoter.
Thing is overt, blatant and obvious use of class A substances is something that in more recent times has come to the fore
A bit like weed smoking- it all used to be more covert and subtle, not so these days
If you're going to advertise ( as in blatantly imbibe more or less in public) what you're doing, don't be surprised if you get caught breaking the law, and get your collar felt for doing so