Smell of cannabis from the neighbours.

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I recently got new neighbours, around 2 months ago, and they smoke pot. I really don't care that they smoke it, that's their business not mine. I'm not a pot smoker, I did dabble a bit when I was in my late teens, but haven't since then (now I'm in my mid 30's). The thing is, when they decide to have a smoking session, the smell travels into my bathroom and is really really strong. I have to keep the bathroom door closed at all times when they are smoking just to keep the smell from going around my house. But then, when you go in there to use the bathroom, you nearly get knocked out! I did mention it to them not long after they moved in (the first time it was noticed) and it doesn't happen too often, but should I mention it again, knowing they are fully aware that the smell travels to my home? Or should I just leave them to it and let them get on with their lives? I have no intention of telling on them, that's not my way and again, it's not my business if they smoke it.