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Any science behind this approach? Could it be psychological ?

Not really psychological, 2 years of not smoking, I'm actually free and never crave smoking, even now, I am no longer addicted, I can stop smoking anytime, I only smoke after meal so I don't get cold.

That's excellent. I like when people are able to discontinue negative things abruptly, "cold Turkey " as they say.
I feel like mind over matter is real phenomenon

Now that's odd. Any other side effects?

Not really a side effects, just easy to acquire cold when not smoking.
May be this is the reason why 2nd hand smokers die first.

Ha, now you can just say its smokers cough, not a cold: way better!
JK, I smoke too, damn "good" habit.cough, cough

Smoker cough when you're smoking, I was not smoking for 2 years and I'm free of smokers cough, what I get easily is cold and flu.

Sounds like your immune system may be running a little weak. Look into gut health by Dr. Josh Axe. He has a bunch of great videos on YouTube
Hope that can help, my friend.

When i stopped smoking 30 years ago i had no problems, i'm 30 by the way.