It used to be a webseries before getting picked up by HBO (you can still go watch their old episodes on Vimeo). It's about a weed dealer in New York, but it uses the dealer as a kind of window into people's lives; almost like a comedic/fictional version of Humans of New York.
Each episode is essentially a vignette about the lives of the people he is delivering too rather than being about the dealer. It's excellent
Is this right?