I imagined there was a tap in my brain and each time I take a puff, this tap turns on to release some satisfaction fluid. This happens approximately 10-15 puffs per cigarette 20 times a day. When I stopped puffing, after a while my brain realized "hang on, no satisfaction fluid is being released" this is not normal. I noticed this as my nervous system was out of whack, kind of a distortion with my nerves through out my whole body. Instead of getting things back to normal (having a smoke) I decided to sit with these awkward and rather uncomfortable sensations and told myself "this is the new normal until my brain and body gets used to no more satisfaction fluid". I gave an estimate of 18 months then I expected a proper more balanced "NORMAL". I smoked my whole adult life so once I stopped, my brain couldn't get back to normal coz normal was smoking. Instead my brain developed a new "NORMAL". It's been 3 years and yes I feel incredible and it just gets better and better with time. My main point is "Don't be fooled by the prehistoric part of your brain which lets you know that this is not normal by disrupting your nervous system". Instead let the advanced part of your brain over-ride by knowing that in time a new "NORMAL" is imminent.