weed is physically addicting, not to mention psychologically. The physical addiction is not intense but on par with cigs. The withdrawal syndrome is acutally in the DSM 5
I am addicted as I use it nightly to sleep and as an anti-depressant but it works quite well for me and I have no real negatives besides the want to do it. Couple that with the health benefits as documented in the lit, blood sugar control, neuroprotection, anti-inflammatory, pro-apoptic etc I think it is a fine addiction to have.
Also, what many don't know about weed is that it has a dose dependent response on serotonin, low doses massively boost it reducing OCD, improving mood while the inverse occurs for higher dosages. Some conditions have low anandamide as an etiological factor (endogenous cannabinoid) and weed treats that well. It also inhibits the orbitofrontal cortex, something which is the center of research around hyperactivity and OCD.
I do go days without it, weeks at times but I prefer to have it like a nice glass of wine (I don't drink but probably should based on the health benefits.)