[caption id="attachment_7174" align="alignright" width="210"] 3D Cannabis Center[/caption] The first legal adult marijuana sales will begin Wednesday, January 1 in Colorado. Leaders of the initiative that made marijuana legal, Amendment 64, will hold a news conference at 7:30 a.m. MT at 3D Cannabis Center in Denver — a licensed marijuana retail store with on-site cultivation facility — followed by the first sale at 8 a.m. MT. The licensed marijuana retail store is 3D Cannabis Center, located at 4305…