DRUGS AND SPORTS

In my opinion, the drugs are good for nobody. However, many athletes take drugs to improve their performance. Certainly, if some substances non injurious harming to health was were legal, the scientists would be able to research more about them and making make safer their consumption safer. But, in on the other hand, any artificial substance is bad for the organism body. Although some of them, such us medicines, are necessary sometimes, we shouldn't avoid to take drugs unless this it is necessary, even more if we are athletes. Taking drugs to win a competition is cheating and illegal. It isn't ethical.

Good job. My corrections are in red and my suggestions are in blue/gray.

When you wrote "we shouldn't avoid to take drugs" you used a double negative. I think you meant to say either:

we shouldn't avoid to take drugs

we shouldn't avoid to take taking drugs