Stimulants and human body reaction to it.

Respects,
                I'm not posting a question here, just floating an idea. The way stimulants(*leave halucegens out*) work, the  results they produce among human behaviour, in what way do you think the result in itself is bad as it results in more productiveness, lesser fatigue etc. I believe that most of us who have experienced and know that the lopside to this is the harm to our body. Now I ask you all, who ever have been very physically active and taken to drugs later durng the course of life. Do you remember the high stimulus you used to feel when you used to walk out of your gym satisfied or field winning a game, sweating and breathing the good old oxygen we were meant to breathe, does that high not resemble the first snort of coke ? or the first few mintues of XTC ? Yeah it does ... Now I'd like to go to the next few minutes, or hours of the effect of the above mentioned drugs. Having done it I know there is no way that we can in any means physicall induce those effects by any means. Meditation gives a person focus and calmness but not the instant stimulas compared to the ultimate effect of those drugs. Now I come to the question, What do you guys think (*something not chemical*) can help us simulate such an effect within ourselves without those chemicals (*Which anyway just play with the quantity and release of elements already in our body*), Cant we Just do it by our own conscience and will ?