Why? Don't you think adults should be allowed to choose if they want to take drugs?
Why should people be allowed to drink alcohol or smoke cigarettes? How about being allowed to gamble? ban that too? Drive faster than 20km an hour? Let's ban everything that is fun just because some people could be harmed by it.
I know 100's of people who use or used to use cocaine. Bankers, lawyers, judges, business people, chefs and both men and women. None of them had any issues.