[knarf]

Actually ... if true ... it does.

IF ... ALL lung disease is from smoking.

ALL death is the result of a heart ceasing to beat, but the CAUSE of that cessation could be one reason over another.

IF ALL lung cancer is caused by smoking, but only a few get it ... it is still a true statement

[milagro]

So, you agree with the premise that lung disease can NEVER be experienced by ANYONE who is a non-smoker?