Both my parents smoked and suffered smoking related illnesses, but my mom died more from alcohol than smoke. My dad had emphysema and quit before it killed him, but he still has pnumonia related problems. Both lived to old age.
My wife and I occasionally partake, and we are told we would be 30 IQ points higher if our parents did not smoke. (OK, I'm being sarcastic). But seriously, the only reason for the whole smoking thing is lawyers were able to win large settlements by baffling juries. Smoking should be legal, and restricted only by private property owners including business employers as they see fit. No government regulation is needed here.
I had asthma until I was 15. . . the same age I started smoking.