Whenever a repressed activity is allowed, it's overdone. Wait until some time has passed and it settles down before making a judgement as to whether the population is more debilitated than it was before.
Bingo. It will be a "fad" that will die down to a fixed percentage of the population and a lot of these stores will go belly-up.
In the mean time, I'm all for states legalizing it and taxing it SO LONG AS it is "Revenue Neutral." Make them reduce property or sales taxes an equal amount for every dollar they take in. The commies love to use that term when someone proposes tax cuts, backhand them with their own glove!
By "overdone" do you mean just more than what it will settle down to? Because although the statewide totals sound big - as would the comparable figures for alcoholic beverages - I don't know that it amounts to all that large a proportion of the population using all that much pot per person. Particularly when compared to the same numbers pre-legalization.