Weed isn't physically addictive. Psychological dependence is expected though (You'll feel as though normal life is dull, like weed is your escape from problems and boredom), but that's all in the mind. It sucks not being stoned after awhile of constant use. I haven't had weed in two days after smoking every day for nearly a week straight, so I'm a bit down, but no life-threating withdrawal effects can occur.