Following the city’s first medical marijuana sale earlier this week, Washington, D.C. Mayor Vincent Gray said that the city should discuss the possibility of legalizing marijuana. “I don’t have a position on whether to legalize it or not, but we should have that discussion,” Gray told News Channel 8. [caption id="attachment_6838" align="alignright" width="220"] Mayor Vincent Gray[/caption] He said that the topic is an important one because current prohibitionist policies result in harmless young…