I work at a financial institution that banks these businesses, and the guidance we have received from our examiners has changed over our last four exams. We were initially marking 33c when we started banking these businesses in 2014. In our 2016 exam it was suggested we mark 35z and state "marijuana related business." However, we have heard from other institutions in the area that they mark it our original way, and the examiners are okay with it. Whatever you decide, just be consistent. And you must use the term in the narrative, that came up as an exception for us once.