Not really. It’s necessary to have a baseline of teen use before legalization in order to see what the effect was after legalization. And California’s law passed in 1996, so it’s almost 20 years old.
Didn’t know it was as legal in CA for 20 years and assumed they were comparing the past with the very new experiences in Colorado (only two deaths thus far). If so, I’ll use the Emily Latilla response, “Never mind.”