I don't smoke either... but SF is playing God in a major way. I can only hope that this will help facilitate a backlash against these insane liberal policies. A LOT of people smoke in SF too...
I'd be surprised if this covers pot smoke too, since in SF, it is practically encouraged. There's a place in Golden Gate Park called "Hippie Hill." It ALWAYS wreaks of pot. I'd bet that this will not affect that place.