someone once told me that health = long life it can, and they are often associated together, but there are many who smoke a pack a day and somehow live past 100 years then there are many who do everything right, work out, eat well, but get cancer,heart attack,etc and die young if this is the case, what should i do to ensure long life? i would like to live long does diet have anything to do with it? amount of exercise? stress levels? drugs? or is it just genetics?