The fine folks over at the Marijuana Business Daily have tracked the performance of 12 cannabis stocks, ranging from tech and real estate firms like AmeriCann to the lab testing company Pazoo, over 2015 - with some slightly worrying results.

Despite a strong start to the year, collectively rising about 27 percent during the first few weeks of 2015, the stocks ended the year down an "astounding" 65 percent from where they started, writes columnist Becky Olson.

While all of the stocks examined fell significantly, the picture isn't unremittingly bleak: some cannabis stocks did end the year on a positive note, and others - while they finished the year on a downward trend - hit some major, sustained highs.

Check out the chart below - and read the full analysis by Becky Olson here.