How common is it for guys to use steroids?

pr3ttybr0wn
I saw someone's question on here that got me thinking. A user asked about whether he should use steroids or not, and he said it so casually that it made me wonder if it was widespread.

When I think of steroid using guys I think of someone who looks like this link If a guy doesn't look that extreme, then I just assume he's natural. I saw a couple Jersey Shore reruns and Ronnie, I would bet money that guy has injected. But for the most part it's not something I think about when I see a muscular guy.

Is there a deep dark hidden underworld of steroid using guys, where many of them are doing it and it's just unspoken? Or is stereoid use rare?
How common is it for guys to use steroids?
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