Maybe not in Seattle, but it has in CO. Maybe that's because tourism of one sort or another is a major industry in CO.
Plenty of tourist industry here. I think a glance at the map should be enough to see one difference: Washington isn't surrounded by states like Nebraska, Utah etc. Well, Idaho, but eastern Washington looks pretty dry - northern Idaho can go to Spokane and Pullman, but it's a long drive from Boise, and the Tri Cities and Walla Walla seem to have no recreational retail at this point. I bet we probably have as much of this kind of "tourism" internally, folks heading over to Ellensburg from Pasco.
For the kind of thing I thought they were talking about in the article, though, I think that's a little premature. Right now we're still in kind of a wild west, gold rush stage combined with weird regulatory constraints. When the industry is more established, we'll see what the potential is, and maybe arms will be twisted to open up some of the state laws. Right now the farmers are struggling, and the retailers are about as charming as dentist offices.