I desagre with doping subtances in sport because I think all athletes must compete with the same oportunities. If one athlete takes drugs he has playing with unfair ventages over the other.
All the athletes who take drugs are cheats because if they want to win, the only thing they want to do is a hard trainning.
The most important thing in sport is the participation and not to win always and if one athlete dont respect that, he decide to take banned subtances. Taking performance-enhancing drugs leads to a log-term health problems.