>Actually, some people respond better to certain
>drugs than others. Two people of equal talent
>and ability may use the same drug, but one ends
>up getting more 'benefit' from it. Same goes for
>supplements, like creatine.
...And diet, and training, and all sorts of variables. Different athletes respond in different ways. There are many factors that go into preparing an athlete for optimal performance. Volume of training is just one of these factors, albeit a big one in most cases. However, there is also such a thing as overtraining, so it really comes down to intelligent training, not just "training harder". And there are also many important variables besides training, such as diet, legitimate supplementation with healthful supplements, rest, sleep, stress factors in one's life, psychological conditioning, mental preparation, etc. etc. The better athletes will take more of these factors into account, and take them into account more intelligently.
The problem in our sport, as well as other sports, is when some athletes try to gain an UNFAIR "edge" with drugs that might improve performance in the short run, but have long-term potential deleterious effects. Anabolic steroids are a perfect example. It's not that ALL performance enhancing substances should be banned. If that were the case, we'd have to ban water and healthy foods! But when substances are used which produce short-term performance enhancement, but long-term health problems (like steroids) then the integrity of the sport is compromised. The athletes that wishes to protect their long-term health, a worthy ambition, have to sacrifice short-term performance advantages to do so. Thus they become less competitive in their sport. This puts pressure on them to adopt the practices of the less scrupulous competitors in order to remain in the game. This pressure, and its consequences, are the sole legitimate reasons for banning performance-enhancing substances which have potential for deleterious effects. We simply don't want athletes in our sport to be forced to compromise their health to remain competitive. It's a horrible bind and is the crux of the drug problem in sports.
However, substances which might enhance performance but have otherwise health-enhancing effects certainly should not be banned, nor are they typically banned. Good diet, along with some useful supplements like vitamins and minerals that are universally considered healthful are used by most athletes, and that's good! Would we want to deprive marathon runners of access to water because it definitely DOES enhance performance? Absolutely not! Water not only enhances the performance of the athletes, but it protects their health. That's exactly what we want to encourage more of. Therefore, getting an "edge" with legal, healthful supplements that enhance both training and performance, while also protecting and enhancing health, is simply a smart approach to engaging in athletic competition.