Cannabis dispensaries and restaurants are an essential service but grocery stores are not... got it. 
I said a spectrum, and obviously restaurants are not essential services but for some people they are fairly high (eg. those traveling). As I mentioned before, the entertainment industry seems to occupy a special place and restaurants certainly fit in that category as well.
I never mentioned cannabis dispensaries, but since you brought them up where do they fit on the spectrum. I would suggest below grocery stores. I am not familiar with their pharmacological usage so in some cases they my be closer to a drug store (which often have a rotating holiday schedule).