Nenna, that's a good post, but I disagree about addiction. It's more like likeness than addiction. I could be wrong tho, because I class addiction in the following way:
I class the feeling 'I feel like' as likeness rather than addiction. Many times I wish I had a pint in my hand, and many times I wish I was drinking, but I wouldn't class myself as al Alcohol addict.
While the feeling 'I need' 'I must have' is what I class as addiction. If I didn't feel right because I didn't drink since a while, if I feel that I must drink now, and that my body needs alcohol I'd class that as being Alcoholic.
I drink a lot, but I can go on weeks without drinking and feeling fine. An addicted can't do that, his body won't be alright.
Never smoked weed, so I obviously using Alcohol as an example. If you can stop smoking weed for a time and feel fine, then you're not addicted, and as far as I know, weed doesn't have a physical and mental dependance.
I have a friend who lives in Canada, and smokes a shitload of weed, he smokes at least 4 times a week, and when he comes back home, he usually stays for months and he'd feel alright, he wouldn't need weed.