is marijuana physically addictive?

i wish i knew the true answer to that. i'm gonna say no. i have an addictive nature yet i only smoke one or two joints a week. and if i skip out it's no big deal. i get it might be habit forming or one may use it often to treat certain illnesses, but i don't think if you take away a users stash that they would get all "squirrely" like a heroin user or crack head.