In California they're discussing whether marijuana dispensaries are essential. If they decide they aren't, shit's gonna hit the fan quick. People will accept most stores closing for a bit, they'll go a while on limited food access, somewhat longer on a temporary forced staycation (especially those who still get paid), but cut off the dope, there's gonna be rioting in the streets.

but when it was illegal supply was never an issue

Supply still isn't, it's accessibility. Much of the black market dissolved, leaving dispensaries as many people's only source. It's sounding like they'll stay open....for now. Business is booming with everyone home on forced vacation...liquor sales too.