Your example isnt about addiction though. its that most likely you are kinda hungry, want to do something with your hands while you are thinking, or a nervous tick.
mariam webster defines addiction as follows
> : compulsive need for and use of a habit-forming substance (such as heroin, nicotine, or alcohol) characterized by tolerance and by well-defined physiological symptoms upon withdrawal
> broadly : persistent compulsive use of a substance known by the user to be harmful
personally I would not even require the substance beeing harmfull. So yes, you can imho be addicted to peanuts, but finishing the bowl on your desk is not that.
My point in emphasizing is that there are no known physiological addictive components of canabis.
Presumably, the op knows the same, hence specified mentally addictive, but is confused because they don't think peanuts have the same, but they do. Mentally addictive only means you like the way it makes you feel so you keep doing it, not that your receptors actually need it or stop functioning without it (chemical dependence)
Cannabinoids have similar addiction pathways (dopamine receptors) as sex, sugar, and, for this example, salt.
Your example isnt about addiction though. its that most likely you are kinda hungry, want to do something with your hands while you are thinking, or a nervous tick.
mariam webster defines addiction as follows
> : compulsive need for and use of a habit-forming substance (such as heroin, nicotine, or alcohol) characterized by tolerance and by well-defined physiological symptoms upon withdrawal
> broadly : persistent compulsive use of a substance known by the user to be harmful
personally I would not even require the substance beeing harmfull. So yes, you can imho be addicted to peanuts, but finishing the bowl on your desk is not that.