Sometimes Being in the wrong place at the right time (agent orange good example, being drafted put you in the wrong place at the right time one example (chemical causes cancer years down the road not to mention other problems), genetics, and sometimes it's work environment (Black lung, Chemicals/cancer, ect...) Sometimes it's what we choose to diet . Which IMO causes most pre-mature deaths. (Smoking, drinking alcohol, drugs, sugar intake which includes sweet drinks tea, soda, ect.. ( eating disorders..)
Some people are just unluckily beings raised or stuck in bad environment (industrial areas that breed cancers). Few have birth defects or genetics problems that shorten their life which IMO sad they had no choice but got what was given to them....
I for one due to medical advancements have out lived my Genetic inherited problem which 1 in 100,000 get. Some aren't so lucky. I known several people that wasn't sick or in the hospital a day of their life's and had heart attacks due to there eating/liquid/smoking excessive intakes and didn't know they had blockage, liver, or lung problems due to NOT going to the doctor and getting physicals or checkups.
Most of us can prolong life if we are willing to change or habits (yes you can say faith has something to do with it by being able to believe you can change weather it comes form higher power or within). Humans are for the most part living longer due to our ability to adapt and change our surroundings, it don't take no study to figure that out.
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