conclusively?
Yes. Conclusively.
I gotta admit, a lot of the talk about disease is what prompted me to quit smoking.
But mostly it was the cost, the social exclusion, and the stench it created.
There's no guarantee that any one smoker will get any one disease due to their smoking, but it's true that smoking puts you at a higher risk for all sorts of nastiness. Nastiness I'd rather avoid while keeping more dosh in my pocket. :-)