actually steroid use in teens has sky-rocketed this past few years - it's pretty much established fact. I don't know what portion of users they'd make up, I wouldn't guess it would be MOST users, but for sure it's too high - these people don't know what they're doing, and most people are right to be concerned that it's a health risk when abused.
Compare it to other problems in the world today, and it's pretty minor, I wouldn't argue that - the number of users, even teens who are seriously hurting themselves with this stuff is probably INCREDIBLY low, and orders of magnitude lower than drugs/alcohol/guns are doing us in.