Everyone has heard of someone who smoked and drank and lived to a hundred
It's interesting that the oldest known human to have lived (122!) smoked too: https://en.wikipedia.org/wiki/Jeanne_Calment
Calment continued smoking in her elderly years until she was 117
But I'd say she is definitely an extreme genetic outlier, and would not bet that she could've lived longer had she not smoked.
(Disclaimer: non-smoker and no interest in doing so either, for other reasons.)