if it's 4 foot before flowering, then yeah, i'd have thoguht anyone with half a braincell would notice what should become an absolute monster, as said, smell, maybe, maybe not, it might just get blown down the road, or ignored as simply "smells like reefer" but if a policeman were to walk past and catch a honk or a glimpse, then yeah, he's not gonna just ignore it, he'll probably think "ello ello ello!"
personally, unless in a legal state/country, and you know people wouldn't rip it if they saw it, then i plain wouldn't grow on a balcony, that's just asking for the police to come and pay you a visit if you ask me