There are MAOI's (I think that's the term) that are in certain alkaloids when tobacco burns. So it's messing with ones Serotonin. Imagine fixing your Serotonin levels everyday and then just stopping it one day...
I also experience a certain spaciness constantly. Real PITA when I "forget" to put a Potato Gratin in the oven for the Lamb!
And WTA's have those alkaloids.
I'm not a Dr., nor do I play one on TV
I think dopamine is a factor as well as serotonin.
I have read that the many components of cigarettes that make them even more addictive can eventually diminish the ability of brain & body to produce natural levels of dopamine and serotonin, and that once someone stops smoking, it's hard to regain the normal levels of natural production.
That sounds quite plausible to me.
This makes for some informative reading:
The SECRET and SOUL of Marlboro
My thoughts about the length of time and amount of cigarettes smoked probably making the concentration/focus aspects vary once stopped do seem to be likely.
Because of that, it's also likely - I think - that the time it takes to hopefully reverse the levels of naturally produced serotonin and dopamine, may vary a lot between individuals.
Some information states a few weeks, others say longer.
I've had poor contrentration and staying focused since around a month after I stopped smoking. I think worrying about it perhaps exacerbates the issue too, but not doing so is easier said than done.
I do use a little WTA now and then, and I've been looking into foods and supplements to help levels of serotonin and dopamine. Most of the foods suggested are those that we already have in our diet, so that's not the answer for me.
I'll be trying some of the available supplements more in the coming months to see if they can kick-start things to improve permanently.
Reading the components of commercial cigarettes/tobacco is hair raising, and other information such as the effect on every part of the body just as worrying. There is every reason not to begin smoking again, and every reason to find a way to function normally without smoking cigarettes etc.
To me this all compounds the immense value of e-cigs to anyone finding it hard to give up, and for continuity for those that do stop.
To find something as excellent as NT keeps the pleasure intact and the need to smoke at bay. Clark obviously looks at
all aspects of the e-liquid, including the need to keep our interest lively, our cravings satisfied, and with the extra advantages of a true family spirit.