How my father-in-law quit smoking

Speaking of few cigarette smokers being real biological addicts, I thought it would be interesting to tell the story of my late father-in-law. He smoked cigarettes for at least 30 years in China. In the mid 90's he came to the US and stayed for about 9 months. Since none of my family here smoked and no neighbor did, he didn't either. Then he went back to China never smoking again. Unfortunately he died a few years later as a result of multiple complications. Early years of smoking may have contributed to some of his diseases. (Unrelated: he left to the Chinese readers a free book about dam hydrology partly written during his stay in the US)