Is there a Marijuana addiction?

Is it possible to be addicted to weed? I always thought that it wasn't so I went ahead and did it everyday for over 10 months. NOw I have a drug test coming up and not smoking is killing me. I don't know if it's a coincidence but I have trouble sleeping (and when I do I have dreams and I can't tell the difference between the dream world and reality) I've been very irritable, I'll go from being tired and sick one hour and wide awake and fine the next. Worst of all, all I want to do is get high!

But I can't get addicted, right?

: http://alcoholdrugstreatment.info/is-there-a-marijuana-addiction