My first 2 years of college I lived in a Frat house with like 50 other kids my age, and more than half of us smoked pot.

The house had about 30 bedrooms on the 2nd and 3rd floor.

So at anytime of day someone was smoking somewhere. My Weedar was pretty good and I could usually sniff out the session. So I was that annoying guy sometimes, but I smoked plenty of people out so it was cool.

The trick was when you were smoking with a couple bros in your room you had to keep the smoke from wafting out into the hall so none of these stragglers could find your session. And if they did come knock on your door, everyone would be quiet as can be and try to convince the person no one was there. Kinda a fun game.