Pro tip if you're handing over money: give the coins first, and then notes. It makes it much easier, because coins on top are likely to slip off and require more careful handling.
Not even joking. I don't know if it's my state's specific laws or what, but the dispensary cashier can either process your card like an ATM (they round up to the nearest $10, then give you the change) or they can process cash.
There is a third option, but it involves downloading an app specifically to pay for cannabis. And... yeah, I'm not doing that.
Yeah in truth I haven't used physical money in ages either. Tap to pay is so much more convenient, and even before cards started having that, inserting and entering your PIN was still way more convenient than the annoyance of cash. If I find out a place doesn't take card, I'll usually just walk out.