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This happened to us a couple of years ago, every night our bathroom would stink up of weed because of the renters below. I politely told them that we could smell their weed, and that my wife was pregnant and not happy about it. The place never smelt of weed again.
She was neither my wife nor pregnant at the time, but she is both those things now so I guess the lesson is, if you're going to lie to get what you want, be ready to live that lie.
Had new downstairs neighbours move in a week or two ago, a parent has bought the flat for his student/graphic designer children. They seem ok but the smell of weed is getting fairly invasive in our flat during the day and evening. Don’t really want to sour the relationship this early by asking them to please be considerate/open a window etc so weighing up how to approach it