My thoughts about cigarettes vs cigars notwithstanding, we have no idea what their nutrition and lifestyle is like. They might have spent all day out in the sun gorging canola oil and avocado
Also they are all bar one pair, women. With smoking/nicotine lowering estrogen/acting as an aromatase inhibitor (Sure I read that on here?) this could also be an important factor.
Yes, but aren't there studies that all cause mortality is significantly decreased the longer the person has ceased smoking? And many others...