Green Arrow was originally developed as an archery-themed version of Batman, but in the late 1960s writer Denny O’Neil decided to emphasize another facet of the character’s Robin Hood inspiration and made him a left-wing crusader for social justice — in contrast to Green Lantern, who stood for law and order.
The comics moved into other adult themes, and Green Arrow’s sidekick, Speedy, became addicted to heroin. (You’d expect amphetamines, wouldn’t you?)
Anyway, the linked Let’s Be Friends Again comic strip has Oliver Queen facing sanctions for another kind of drug use.
It makes perfect sense, by the way, to assume that Batman, if he were real, would use performance-enhancing drugs — like many high-level athletes and special operators.
Batman was shown to experiment with performance enhancing drugs in the Venom arc of the Legends of the Dark Knight stories. He gave them up because they affected him mentally.
Comicbook drugs are, of course, killer drugs.