There were guys on my football and baseball teams in high school who were on steroids. I was a gym rat back in the day and their gains were 10x my own. I could have, but didn't. I was never a football captain but I was an alternate on the baseball team. I played clean. Would I have done it to get to the next level? I doubt it.
On another note, I WOULD like to see the Olympics make steroid use mandatory only so I can see someone run the 100m Dash in 6 seconds with the guy SCREAMING the whole way. I like comedy.