[Ken H]

US News says data from the 2009 CO survey showed 25 percent past month use and 45% lifetime use.

http://www.usnews.com/news/articles/2014/08/07/pot-use-among-colorado-teens-appears-to-drop-after-legalization

[steve86]

Here in Washington only the upper class kids could afford the retail prices, and they can’t buy legally anyway since everyone gets carded three times each visit.