[jordigh]

Prostitution harms too, even legalised:

http://vaw.sagepub.com/content/10/10/1087.abstract

[kristofferR]

That's written by a well known feminist anti-pornography and anti-prostitution activist, who was accused by her research assistant of fabrication and misrepresentation of data...

https://en.wikipedia.org/wiki/Melissa_Farley

[riyadparvez]

I do not think prostitution does harm to the same extent smoking does.

[jordigh]

It exposes you to STIs that cannot be prevented with condoms, if nothing else.