I am aware there are other causes of emphysema and other lung diseases, and that perhaps too much emphasis is placed on smoking. A friend of my Dad's lost his brother to lung cancer in his 30s and the victim never smoked.
But I would still offer the old advice about smoking. Bad enough there are causes of emphysema and other such diseases that we can do little or nothing about. But people can either not start smoking or quit. With smoking, there are choices.
My great grandfather died of lung cancer. He never smoked.
I did for 35 years, and quit. I breathe easier.
Of the list in my post, there are a few other things I could add which might contribute to pulmonary problems someday, but I have been exposed to all of that and fine oil mists (diesel) and plenty of VOCs in my time as well. During that time, I worked at altitudes from within 10 ft. (+/-) of sea level to 9000 ft., so my lungs were busy along with my metabolism adapting to changes in O
2 content of the air around me and relative humidity from 99+% to nearly zero--tidewater in summer to high altitude desert in winter.
I am approaching 11 years without a cigarette, and thankfully, the lungs still work fairly well. I believe the anatomy and physiology of the individual have some influence on how severely what pollutant affects the individual and the long term effects, but some crap will kill you, regardless.
I am gobsmacked at how some of the same people who waged war on tobacco can turn around and push for making marijuana legal, but that is a different issue.