anyway, I've skipped most of this thread, so I'll point this out simply to the OP:
A bonafide addiction occurs as a result of a biochemical response--the addictive substance, nicotine, heroine, etc, actually REPLACES the natural neurotransmitter that your brain needs to function. Nicotine, actually, can be found naturally in extremely small "inactivated" amounts in your body in an extremely important molecule, NADH (NADPH).
Not exactly related to that, but once you start sucking or chewing on tobacco, the higher concentration of nicotine now entering body suddenly becomes a much more effective chemical at transmitting certain neural responses. Eventually, the brain adapts to the presence of nicotine, and systematically shuts down production of the normal neurotransmitter.
true story.
soon enough, the only way for you to obtain this essential hormone is through tobacco. It's completely PHYSICAL. You can throw out all the mental stuff you want, and ignore that, but the cravings, sweaty palms, nervous ticks...all a result of a sudden lack of essential neurotransmitter when you try to quit. It will eventually be replaced, but that time after quitting is sheer hell.
and it's much, much, much worse with heroin. meth.....