[cstavish]

Dude, your missing his point entirely. He's saying that young males are smoking weed instead of doing hard drugs and therefore less likely to commit violent crimes. It may or may not be true, but it's an interesting thought.

[bmelton]

It's slightly more than just interesting. It's been a fairly long-held belief that, at least in New York City, their continued and constant drop in crime was largely attributable to the fall in popularity of crack and cocaine usage.

I'm not sure why he's been downvoted to gray. I don't know that his ideas extend well to areas outside of NYC, but there's at least one (fairly large) data point lending credence to his notions.