Why does performance-enhancing drugs cause a false sense of accomplishments?

sn't it because they excite the same areas of the brain as does euphoria? And a related question...in athletics, is it really accomplishment that is being generated, or is it euphoria? I am not certain the brain can distinguish between them.

it causes false sense of accomplishmentz because the person taking the drugs knows that it isn't his or her own abillity.
itz an ability due to artificial enhancers

hope that helps