I cannot say its the sole thing that has caused the current state of affairs in the state, but it's been roughly 10ish years and the social decline started about at that time. Speaking with many locals (completely unscientific) but many feel like this was also the point in time where it brought it many individuals that did not have a plan in life but came for the green gold rush, or to merely be in a location where it was easier to buy and safe to use without risk of jail. Many believe it was this influx that started to erode society a bit. Homelessness and pan handling went up. Crime slowly went up. Etc....
Clearly there has a multitude of other contributing factors since then (covid, housing crisis, etc...) but this sort of started the ball rolling down the hill and the additional issues helped with momentum.
This might not be an issue with other states that are legalizing now because it's more available in several states but as one of the first few to legalize it, I feel it definitely hurt more than it helped.