This is one of those issues where things can get blurred, I have to confess I'm a little unclear as to your exact position as well so I'll try and be clear.
Firstly I'm pro informed consensual activity, whether or not that activity is distasteful to myself or society at large. As far as drug use and prostitution are concerned I'll go with history and note that humans will always be doing both.
Now, in response to someone raising prostitution, if consensual, being okay you responded with a link to a UN report on human trafficking and a US study on drugs and prostitution being highly correlated.
These are fair points to raise, my position would be that if various countries decriminalised drug use and prostitution then they could be regulated as many other activities and industries are which would lead to a strong reduction in health issues and unsavoury slave like conditions.
The tone of my post was to strike a response, if anything I was the one expressing an anti US (government policy) sentiment. I noted you cited a US report linking drugs and prostitution (although I note it mentioned drug use in London as well) and I reacted rather strongly to that. If you meant to imply that prostitution -> drug use + pimping then I disagree as I feel that correlation does not equal causation and personally feel that federal level policy that declares a war on drugs and regards the business of sex as immoral is more likely to be the root cause of problems.