Given that lightning enables fast, cheap micro-transactions, would you as a bitcoin holder be willing to spend your bitcoin to purchase cannabis at a dispensary, assuming that there's a super simple, intuitive way of tapping and paying with lightning as easy as your debit card?
every dispensary i've seen accepts cash and credit/debit cards just like most businesses. how would lightning be any more convenient? if anything (at least with the current tools available) it'll be a hassle.
if they were truly pseudonymous transactions, it would be more interesting. at the weed clubs, your ID is in their database and every purchase you make is linked to your ID. i'm more interested in brick-and-mortar situations where i don't need to fork over my ID and fill out a membership form.