Why should you not use cocaine?

Yes, very much so!!! Its known as an illegal drug; that should tell you right there that it can't be good for you.

Use of cocaine without a prescription results in you being thrown into jail. Jail is bad.

cocaine is a schedule 1 drug, meaning there is no prescribing it to people anymore, back in the early 1900's it was prescribed, along with heroin, but not anymore.