Posted: 10/11/2015 at 12:44
The banning of performance enhancing drugs is less to do with cheating as it is to do with protecting the health of the athletes. It eventually becomes a game of who is most prepared to push themselves towards risk of death or disability. All competitive sport is about achieving an advantage, e.g. the superfast swimsuits, better training, better food, etc that your opponents do not have.
Once a ban is in place, of course it is cheating to use them and appropriate penalties should be in place for those who flout it.