After practicing medicine for 36 years this is what I have observed:
*A very few people can smoke like a chimney and exhibit no ill effects. I suspect that this is genetic since most of them provide a history that their parents smoked and lived past 80.
*The majority of people who smoke will exhibit decreased lung function after about 20 years of smoking. If they continue to smoke their lung function will continue to deteriorate.
*Some people have poor lung function regardless of tobacco use. If they smoke it only makes things worse.
If we graphed my statements they would resemble the Bell Curve just like most things in Nature.
All this being said, I am not in favor of anyone using tobacco in any form. Why take the chance?
OTOH, it is none of the gubbmint’s business. If you want to smoke, have at it. Its your life. Just don’t expect me to feel sorry for you when you develop COPD or lung cancer.
But I still fully support businesses and adults making the decision for themselves. Nobody gets out alive.