We've definitely thought about it but don't have a correspondent bank that will process our checks/other transactions for those businesses. Initially, we were all opposed to doing it, but then someone asked me what we would do if a large ag customer came in and said they wanted to. Especially if we'd lose their business without doing it.
Whatever happens, make sure if you start banking marijuana businesses that their accounts are sufficiently service charged to make up for the amount of time you'll spend on it...