A study done by the WHO 14 years ago states that
health problems from "the use of legal substances, particularly alcohol and tobacco, are greater than health problems from cocaine use." If that weren't enough, it states that "few experts describe cocaine as invariably harmful to health," and that problems "are mainly limited to high-dosage users." Indeed, "occasional cocaine use does not typically lead to severe or even minor physical or social problems . . . a minority of people start using cocaine or related products, use casually for a short or long period, and suffer little or no negative consequences, even after years of use."This study was done 14 years ago, but the US pushed to suppress the study as it didn't like the conclusions. As a result is was never published and only came to light because it was leaked out.
If your only response to contrary evidence is to ignore or bury it your position cannot be terribly strong.