How prominent do you think steroids is amongst big-name WWE superstars?
 

And by steroids I mean steroids, the bad stuff. Of course they all take some kind of supplements to gain mass, but that's not necessarily steroids.

Not that prominent amongst the main stars. I'm pretty sure Lesnar doesn't roid. Triple H... is questionable. Cena does/did. I doubt Angle, Benoit, Guerrero do. Perhaps Eddie might have at one point in time. Big Show... I dunno. Rikishi has man boobs so maybe. Holly probably but he's not a big name. Jericho looks natural. Batista possibly, but he seems like the type of guy who wouldn't do that sort of thing. Orton perhaps...

Scott Steiner is the only one that comes to mind

I doubt any of them currently do, maybe Steiner.

As for a long time ago, plenty. HHH for sure.

Sadly, I think Eddie G and Benoit probably both used to.

Among the main names,probably not that many of them currently;
mainly due to fear of being exposed for it. There is more use in the
lockerrooms than what most people think though.