Niacin for Smoking Cessation

A friend writes,

I quit smoking three years ago, in just three days. I had no withdrawal symptoms. I used no patches or
meds. To do this cost me perhaps five dollars.
I owe my quit-smoking method to an observation I made whiletalking with my cousin, who is a medicated schizophrenic.
Smoking and schizophrenia, I noted, seem to go together.
During long-distance calls to him, he kept running off for a smoke. "Gotta go - have to have a
smoke".
Extraordinary! And it happened during our conversations all the time.

Readings in biochemistry had alerted me to the importance of Niacin - Vitamin B3 - in reversing and controlling one type of schizophrenia. Like pellagra, "the schizophrenias" can be cured with B3. B3 or Niacin is also called Nicotinic Acid.

Might the brain accept Nicotine and Nicotinic Acid like right- and left-hand skeleton keys? If so, did "gotta
have a smoke" mean "I need niacin"?
Was I hooked because my brain craved Niacin?

To quit smoking, I chose a time when I had no tobacco in the house. My lungs hurt and I was motivated.
From the local pharmacy, I purchased some Vitamin C and Niacin - both very cheap. I chose the B3 "flush" variety - and proceeded to load up with both. For three days, every time I went to urinate, I took 500 units of Vitamin C  (one pill, 500 mg) and 100 to 250 mg of Niacin. I experienced some uncomfortable itchy skin flushing, but nothing too painful.

I was delighted to find that Vitamin C detoxed my body, and I had no craving for nicotine. They say that after
3 days, nicotine is no longer in your system, and I have never smoked again.