Since Colorado voters approved Amendment 64 in 2012, and after the historic first sales of recreational marijuana began in January 2014, a majority of state residents still support legal marijuana sales. [caption id="" align="alignright" width="266"] NBC News/Marist Poll[/caption] According to the Huffington Post, a new NBC News/Marist Poll demonstrates that 55 percent of adult Colorado residents back the law that made the regulated use, possession, and sale of marijuana by adults legal, as opposed…