I have never smoked - and would class myself as an ardent non-smoker, as are my two brothers - but my father did for most of his life, ever since he was a young man, long before his marriage to my mother.
From a period shortly before his retirement, - and, by then, he was reducing his nicotine intake anyway, - he had accepted a family request (none of the rest of us smoked) that he confine his smoking to the kitchen after meals, leaving the rest of the house smoke free.
After the cheese course, he would announce that he would light his pipe, and that if we wished to leave the room - or suffer smoke - now was the time to do so. We would abandon the kitchen, he would pour himself a whiskey, help with the washing up (or, often, do it), sometimes then proceed to do the ironing, listening to classical music or jazz on the radio or on a CD, pour himself another whiskey and relax for a few hours, sipping, smoking, listening to seriously eclectic music and chatting to whoever came by the kitchen.
Earlier, he had made a few fairly feeble attempts to give up smoking, but, as other posters have already pointed out, you have to really want to do it, and, until quite late in his life, he didn't really wish to give up smoking. He had his routines - no smoking ever before dinner - and his forms of relaxation - which included smoking, and had no real desire to change what was a very pleasant life.
Then, in 2001, a medical examination revealed that he needed a heart by-pass, and also required stents. As part of his treatment, he was advised to quit smoking. Permanently.
I recall his last smoke, the evening before his cardiac operation. He lit his pipe, proceeded to smoke it, hugely enjoyed it, sighed, and simply announced "That's it". After the operation, he had already decided that he would quit completely, and so he simply went cold turkey, and never smoked again as long as he lived.