I lived in Holland for a lot of years and I had arranged for my sister to meet me at a friends house.
Everyone except my sis smoked and we always hit it hard when we were together, after about 15 minutes the room was full of smoke.
My sis got so shitfaced from the smoke in the room that she giggled all the way home on the back of my bike , it was good because usually she was a very stiff passenger and this time she just relaxed.

That was many years ago and she still blushes when I mention it.
It was the first time she had ever been high and it was just from what was floating in the air.