The level of substance use and abuse across all sports will be far greater than anyone dare imagine. The rewards are too great and tempation very difficult to resist. Imagine if you can't shake a niggling injury never mind want to gain a tenth or two in time terms. Not comdoning it just saying it must be difficult when it's you livelyhood.
Lets not forget that UCI seems far more prepared to do the blood letting in public where as the FA and premiership teams cover for players saying they have an injury when they've been done for recreational drugs.
Think there will be a big scandal when they finally catch the Jamaican athletics team. Only reason they caught Dawain Chambers was that the Doctor managing the administration and cycling of the performance enhancement substances, used the list of athletes he was working with as part of a plea bargain for tax evasion.
I also think the media and public at large have a deep misunderstanding of steriods, the family of steriods are used widely in medical science and vast portions of the public are in much better health and physical shape due to being perscribed steriods.
cortisone is a classic example of this.
Good film to watch on this subject is called Bigger, Faster, Stronger
http://www.biggerstrongerfastermovie.com/