Some folks are probably genetically inclined to develop certain condition regardless of what they do. When I was still working we had to have a yearly physical and it always involved one of those machines that checks lung function and capacity. Nearly every time the tech would run the test on me, after looking at the results would say “Well, looks like you never smoked.” Then I’d tell them yup only about a pack a day. Then they’d look at the chart and just shrug. Always showed above 100% Weird, I know.
My Brother-In-Law is an Oncologist and he will echo the same facts. There are genes in our bodies that no matter what we do, will become succeptible to cancer and ultimately kill us.......
heheheh...same here...routine 'listen to the lungs' events and the Doc will comment that i have better sounding lungs that people half my age or some such...
then i inform them ive smoked for 30+ yrs and can still blow a candle out from across the room...they say i better quit while im ahead, and i agree, but its definately not settled science, or guaranteed to cause a problem...