Smoking doesn't kill everybody. My parents' neighbor was a lifelong smoker. She lived to 94. She survived 4 bouts of cancer--but not lung cancer; I forget what carried her off. She also drank in moderation.
Another elderly neighbor swore by cocktails every afternoon at 4. We'd go visit her, the cocktail hour would slip into dinnertime and beyond. She got through every day by being sweetly snockered. Died at 89.
I think that research has shown that a lucky few get really good genes and they can pretty much do what they want. The rest of us have to be careful.