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By no means does it explain everything, but I think it explains a lot

Ann Oncol (2017) 28(5):93845.10.1093/annonc/mdw677 15 DimitrakopoulosCMBeerenwinkelN

Even Benny Shacklett and all those rodents

This relationship holds true regardless of age and other risk factors, including cardiovascular disease, he adds

By August 1962 Philip Morris' management decided on both a high-filtration menthol cigarette and a carbon filter cigarette for the new pack

Some (very rough) numbers for the Netherlands indicate that smoking reduction alone added around three years to the average lifespan over the last 30 years, and more years for the former smokers themselves[6]