Well, finally! Let me be of some assistance. (In my best Norm from Cheers voice), Ya see, the Marijuana smell is derived from the heating of the THC molecules found mostly in the leaves, and the...
Had ya going didn't I?
From what people have told me,... pots gunna smell musty. Fried food is gunna smell like fried chick, french fries etc.
If the roomies have a difficult time remembering sentences, it's probably pot.
Seriously, trust your gut.
peace.