I live in the same state and Guests smoking weed is a TERRIBLE problem! The STINK itt leaves is awful. There is also a residue that pot and tobacco leave on the walls, floor, furniture, etc.
You are doing your property a disservice by allowing weed. And if they smoke weed, they will most certainly smoke tobacco if they are cigarette smokers.
As I type this my eyes are stinging, from the pot and cigarettes that the Guests 3 floors down are smoking. The smell is disgusting.
I will be keeping 100% of their security deposit.
Also note, Airbnb does NOT consider weed or cigarette smell damage that is covered under their "$1 Million damage" policy.
I found out the hard way after I had to pay out of pocket for hundreds of dollars in cleaning.
Needless to say, I've increased my security deposit.
Good luck.