All part of economy that is not legalized by government is in hands of mafia bosses, if there is no government and police system, than everything will end up in hands of mafia bosses. That is natural mechanisms in society without legal authority.
I'm not so sure about that. There's not really a marijuana mafia, AFAIK. The government doesn't crack down on marijuana too hard, and there's more than a handful of young people willing to get into the business independently. It's quite different for drugs like cocaine, where governments respond extremely harshly, thus requiring a high level of organization and funding to stay alive and outside jail - and with stakes so high (because of the government), it's definitely going to encourage a very aggressive/deadly environment.
Prostitution has a similar situation, with a very "normal" rate of mortality compared to other jobs, though a high rate of violence where illegal. Though all we hear about are abusive pimps and gangs in news and movies, a
recent study found only ~10% of underage prostitutes had a pimp. For adult prostitutes, this was
7% in Miami, though stats on this are hard to come by. Either way, there clearly isn't some pervasive hooker mafia/union.
