What kind of data? Conclusively linking lung cancer to smoking? You tell me what you want, I'll get it for you.
Riddle me this, why is the highest per capita smoking population in the world also the lowest per capita heart and lung disease incidence population in the world?
3/4 of smokers will not get COPD. Instead, they'll get lung cancer, emphysema, smoking-related heart disease or stroke, breast cancer, throat cancer, mouth cancer, or any one of dozens of other ailments that have been conclusively linked to smoking.
Do you have factual data supporting your statement that 1/4 of smokers will not get COPD..but will get the things you listed?
I believe I understand what you are trying to say...but statistically IMO, the way you have stated it...it's unsupportable.
FWIW-