Now I know people have the right to smoke on their own balcony if they want to. But here's the thing.
My and DP's flat has entirely south-facing windows, so when it's warm and sunny the place turns into a furnace. The thermostat read 35° when we got home today. Our building is an L-shape, so there's a flat on the floor below us whose living room balcony is below and to a right angle from our bedroom window, and the people who live in it have been smoking out there- presumably so their flat won't smell. We had our bedroom window open to try and cool the room down, and now it stinks, and I mean really stinks of cigarette smoke. I won't be able to sleep in there tonight.
Again, I know they can smoke on their balcony. But would it be so hard to show some consideration, when they can see that our bedroom window is open and their smoke is going right for it?!
Aargh.