The effects on public health and safety and on the relationship of law enforcement to minority communities will take years to manifest fully, but one impact has become abundantly clear: Legalized marijuana is getting very cheap very quickly.
Links
[1] https://www.washingtonpost.com/news/wonk/wp/2016/05/04/the-price-of-legal-pot-is-collapsing/
[2] http://rethinkpot.org/tags/washington