He had some type of surgery on his sinuses. He also had high blood pressure showed signs of heart arrhythmia. Nothing out of the ordinary for a person his age.

>but smoking organically grown tobacco without additives and filters doesn't seem to do much harm from my experience.

Get an x-ray or ct scan of your lungs. Or get your VO2max tested. Quit for a month and try testing it again. I assure you, you'll see a difference just from your airways and nasal passages not being inflamed.