Earlier than what? I could not understand why my father, a non-smoker, died at 64. In fact I don't understand the death of my non-smoking grandmother at 55, my non-smoking friend at 32, and the "early" deaths of virtually everyone I have known and lost...all non-smokers. If smoking guaranteed that I would not live to have Alzheimers as my mother-in-law now has, I would keep smoking rather than vape. As for diminished life, my mom and my mother-in-law are both living that...and they are both lifetime non-smokers.
Smoking is not the only bad thing out there. And a lot depends on predisposition too. Some of the oldest lived have smoked. But in general, it's a dangerous habit, which is why we are vaping instead.