Thank you for not minding my concern and suggestion on a personal level, William. And at the very least I congratulate you for being a "considerate" smoker, who doesn't subject others to their habit, as you said. THAT is VERY uncommon as most smokers as a "rule" usually are self-absorbed in their habit and could care less who else bears the brunt of it.
In the only thing that quitting helped my father in was in extending his life for a good 30 YEARS, which I know he would not have lived had he continued to smoke. And while (like you said) the effects were already made and he still died a smoker's death, his QUALITY of life during those 30 years also I feel benefited after quitting. He had his heart attack when he was 54 (MY age NOW) and died when he was 84 and before dying he STILL WORKED and was completely active til he was 83 when (as his Lung Specialist put it) he had reached the "end stage of his disease."
Regarding different COUNTRIES' treatment of this "cancer" called cigarettes among the world population, I applaud Canada's treatment of the matter. In the U.S., there's been much chest-pounding on the matter, but, in the end, more has been done (I feel) on an individual State by State level than nationally. New York City ex-mayor, Bloomberg, for example, did just that that you say Canada has done, about taxing cigarettes to the HILT, as he's done with sodas (an "addition" for U.S. children and teens and leading to much obesity), and though he was highly criticized by many for these taxes pointing to claims of "government overstepping their boundaries and rights", he was applauded by others, as he was by myself. Nationwide, yes, they have banned smoking in public places and there's been no TV ads for example for cigarettes since my early or late 20s I think, but even so, Cigarette companies continue to lobby Government and get their way in many other things, just as, ironically, do "Healthcare" companies. After all, these are MONSTER money-making companies, and, here in the U.S., MONEY TALKS and votes are bought every single day, while the good of the people that elected them in the first place are forgotten.
Sorry to get off-topic, if I did, but, even though we've extended to the U.S. and Canada, and even our own personal experiences, in the end, the effects of smoking are the SAME, regardless if the smoker is in Brazil or in America. So, hopefully, I haven't gotten too much off topic, after all. 