I travel through Seattle so I can buy legal, Taxed, marihuana. I have no desire to finance Cartels, terrorism or any other criminal enterprise when I buy marihuana. 
In 1998 Alaska's citizens voted to legalize Medical Marihuana and our legislature came up with a plan that provides no tax revenue for the state, that cost the person $300 for a "get out of jail free card", that then required the person buy from an illegal drug seller, who could then both get arrested, but the Medical Marihuana user could be released because they have a card.
What genius came up with this plan? Most people don't smoke marihuana but a majority of voters agreed that it should be available to people with a medical need. Our legislators ignored that and gave us nothing. 
Now we are getting the same....more nothing. This isn't rocket science, people. Other states managed to do it. We have Washington and Colorado to model. 
Oh wait a minute, they made it happen. NOT STOP IT. Make this happen!