@Ganymede
eh. Not so simple, man. Not so simple. If a guy is alone in a park, smoking some weed, and I want to bring my hypothetical kids to play there, telling him to leave doesn't make me the cunt. (Especially since I don't know anywhere in the United States where it is legal to smoke weed outside of private residences.)
I'd say the same with even regular cigarettes. If you're alone, sitting on a kid's swing and smoking a cigarette-- Someone telling you to GTFO if they have a reason to be there doesn't make them the cunt. It makes you the cunt for being there in the first place.
There's an onus on the smoker to also be aware of where they are and why people might want to be in that space. At a concert, at a park, etc. And to realize that their /stench/ isn't the only thing affecting others. Asthma, allergies, etc. There are actual health issues involved. So it's easy to say 'go find your own space' but when you're say-- at a concert with a billion people smoking in various ways, man, there's no way to find your own space away from the smoke floating everywhere.
If you are in a place where no one needs to be in, where there are plenty of other similar places they could occupy that you are not in, then yes, the onus is on them or me or whoever in this case to take a step however many feet away and find their/my/god's own place.