You are going to live til you die.
Then there was my Grandad. Stubborn diabetic, drank a pot of coffee everyday, smoked 2 packs a day until he had a heart attack at 78, had a quadruple bypass, did finally quit smoking, lived to 89 at home, died in his sleep.
Thats a pretty good run.
Im not pushing just being careless, Im just saying that genetics is probably a larger factor.