Are you sure it's your mom's money? Perhaps oe of the other guys brought the schwag over. Would you feel different if they were drinking? Pot use doesn't bother me at all. I can't smoke it but if I could I probably would every now and again. Getting the police to show up might screw your mom considering it's her house they are toking in.
Violence isn't an answer besides, are you in a position where you can be stuck in the pokey for a while?
I'd tell them to take it outside so it doesn't stink up the place or tell them to go somewhere else.
-Capitalization is the difference between "I had to help my uncle Jack off a horse.." and "I had to help my uncle jack off a horse..
Beauty is in the eye of the beer holder