According to the National Academy of Science, here's what the evidence shows about CANNABIS ADDICTION:
Regular users may experience drug craving (i.e., compulsivity, emotionality, and anticipation), withdrawal and other symptoms of dependence (i.e., emotional problems, giving up activities, using more cannabis than intended). 
A distinctive marijuana withdrawal syndrome has been identified, but it is mild and short lived. The syndrome includes restlessness, irritability, mild agitation, insomnia, sleep disturbance, nausea, and cramping.
These withdrawal symptoms are generally mild compared to opiates or benzodiazepines, such as diazepam (Valium).