Room smells like marijuana or hashish

Something like that doesn’t exist in the neighborhood
(I recommend the ARte documentary "Im Keller", about the topic something like that doesn’t exist)

When you have aired out the room, how long does it take for the smell to return?
And also a dumb question again, do other people also confirm the smell?

And just to ask stupidly again, do other people also confirm the smell?

yes, that has already been answered with "yes"

Something like that doesn't exist in the neighborhood
(I recommend the ARte documentary "Im Keller", about the topic of something like that doesn't exist)

When you aired out the room, how long does it take until the smell returns?
And also a stupid question, do other people also confirm the smell?

Depending, sometimes it doesn't smell for a day. Then again, there are days it smells all day. Others have also confirmed it.

I don't remember where I should look anymore.

As I said:
As long as it's just a smell, I really wouldn't worry, no matter where it's coming from.
Only if there is smoke in the air, there might also be THC in the air ... children shouldn't be exposed to that for too long, but you can see that.

That's my opinion as a non-medical professional.

What does it look like in a neighboring room or the floor above? (has that already been asked).

I would seriously use a police sniffer dog, as already suggested. Maybe it will then work as an exercise and everyone will benefit from it.

Otherwise, you will probably be playing question/answer here forever.

But definitely report what it finally was.

I would seriously deploy a police sniffer dog, as already suggested. Maybe it would then run as an exercise

That would of course be a possibility that promises success. But it has the disadvantage that a potentially found perpetrator would get a beating. I would try to avoid that because I consider the illegality of marijuana nonsense.