You're dreadfully mistaken.
Quite a few wrestlers are juiced, yes...but many arent. They arent too hard to pick out, if you know how to spot symptoms of steroid abuse. After spending a lot of time working with wrestlers I can tell you that yes, some definitely are, but many are not.
Dwayne, by his own admission, did use steroids in the past, but that was in his college ball days (where I first met him and Dany, his ex). He works out religiously, and takes exceptional care of himself. Also, he never has had the odd body mass changes one associates with steroid abuse.
This guy is quite literally the fastest and most agile "big man" I've met, and one hell of an athlete. But thats not suprising...he comes from a very athletic family.
Pro wrestlers today are for the most part exceptional athletes (they have to be to do the crap they do, make it look somewhat believable and not hurt each other). And, like most pro athletes, the most commonly abused drug isnt steroids, its painkillers.
And yes, I know this from firsthand experience.