Sure, but skilled machinist work in a Boeing plant isn't even remotely comparable to the forms of unskilled manual labor common to Appalachia. While the strawberry pickers of California's agricultural industry tend to be undocumented immigrants, and one's drug of choice is significantly shaped by demographics.

I'm not arguing against the merits of cannabis, mind you. I'm just saying that it's lazy and ridiculous to argue, "We don't have strung-out hillbillies on the Pacific coast. Must be due to the presence of marijuana! (rather than the absence of hillbillies)".

The barrier to move and change jobs is much lower