US has imperial for everything but guns and drugs
If we're talking legal drugs, my prescriptions all come in milligrams.
If we're talking illegal drugs, though fractions of ounces or pounds were more common, it wasn't unusual to come across someone selling stuff by the gram back in the day, and I can't imagine that's changed. The weed dude would sell any amount at $10/gram - and yes, I did see someone come with $3 once. ๐ I don't remember the coke dude's prices because that was much longer ago, but he was also totally fine with selling single grams.
Maybe my experience was different because I live in a college town, so the black market was supportive of the small purchases necessitated by student budgets.
I use Textra on Android and I can select which parts of a message to copy. I'm using the paid version and have for years, so I'm not sure whether that's a standard feature or premium. The day Messages stopped letting me color-code each conversation was the day I quit using it; I can't tell you how many times each person being a distinct color has saved my ass from texting the wrong stuff to the wrong person.