The oldest woman in the world a decade or so ago was a French woman who still smoked at the age of about 129. So on that basis surely scientists should be recommending smoking for every body.
"what would be the impact if she wasn't smoking" That's not scientific, its hypothetical.
I am not quite sure whether this is a serious statement. But anyway I will provide my reasoning.
This isn't about a hypothetical scenario; it is about the flawed way conclusions are being drawn.
Let me clarify with simple examples:
"One person drinks cyanide and survives (because of miracle)
"
Does that mean drinking
cyanide will not cause fatality ??
"
One person get stabbed by a knife and do not get injured"
Does that mean that every one get stabbed by a knife will not get injured ??
Your reasoning relies on an illogical generalization. In the case of smoking, you are focusing on just
one individual, while millions of people smoke every day. This might be an isolated case. In proper research using statistical data and sound methodology, a sufficient sample size is required; the sample will normally needs to be diverse and representative. Only then can a valid conclusion be drawn. But in your case, you are basing it on a
single person, while numerous scientific studies conducted by experts published in respected scientific journals have demonstrated the opposite.
Another flaw in your inference is failing to consider that
many factors influence human lifespan, not just smoking. To draw a clean conclusion,
you would need to isolate all other variables, which, in this case, is nearly impossible.