Just because something doesn't make you physically sick when you don't have it (i.e opiates or nicotine) doesn't mean you can't be addicted to it.
There are different intensities of addiction... I smoke nearly every day, and there's no reason for me to deny the fact that it IS an addiction. While not obstructive to my life, it is definitely a mild physical and mental addiction.
If not, you aren't smoking often enough (good for you), or your weed isn't good enough.
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