Weed:
NONE. There is no known dose of marijuana that will kill a mammal. Marijuana is not poisonous.
Pretty much anything will kill in large quantities. Marijuana sure does stink though. It's an unpleasant acrid odor that is just, well stinky and unpleasant. Much happiness to you for wanting to stink up your environment with your stinky habit.
Pussy stinks too but I can live with it.