OK, everybody here pretty much agrees that training at any sort of elite level is unhealthy. Running 100 miles per week, racing at near max capability (say 99.99% effort) and other 'natural' training methods, such as going in high altitude and then droping to sea level to run a race is not healthy. I find that the number of runners dying of hard attacks or falling victim to strokes in their 40s is unusually high and it is probably not due to drugs, but running at high intensity. I for one would have never considered using drugs when I was racing (why? I'm not sure, I guess it's because it was illegal). It even took me years to even take anti-inflamatories. The major problem is that which drugs are 'safe' in the short or long run and which ones are not (although some are easy to identify as bad). Therefore Federations are in a tough position to approve drugs. The other problem is if you forego the 'safe' argument, it will quickly get totally out of control. So this is the situation we are stuck with. Drugs cannot formaly be permitted or allowed.
On the other hand, many drugs used by elite athletes could really have big benefits to increase the quality of life in general. For example Regina Jacob and Merlene Ottey look great for women in their early or mid 40s. There is a whole body of knowledge out there that cannot be shared with the common person because the drugs are banned and athlete-users cannot ever admit that they took them. Furthermore, as soon as they are 'caught' they stop taking them and mess up the data.
For example HGH for the common person is just starting to be popular now, but some athletes have been taking this for over 20 years. The data however would be great to publish and would provide good longitudinal information.