I believe to a large degree that longevity is in our genetic makeup.
I have read the discussions about smoking drinking etc,
But I have a long history of family members that have both drunk and smoked and lived will into their 80’s 90’s very few of my ancestors and died under the age of 75 and the ones that have were married into the family not blood line relatives.
I knew and know all of my family from my great grandparents to modern day and have studied my family history. I have gone back as far as the beginning of the 1800’s
On all my lines and further back on a couple.
I know of none that died of smoking or drinking related illness thus far, or of cancer.
I am only talking about relatives in my bloodline.
Yet I know many that have smoked drunk or done both.
So I do believe it is what is in our genes that counts for a lot.