Key points from article :
Study highlights association, not causation.
People who drank 3-5 cups of coffee per day had about a 15 percent lower [risk of premature] mortality.
More than 4 cups can interfere with sleep and create feelings of unease.
Amount of caffeine in a cup of coffee varies so does individual sensitivity.
Similar benefits from caffeinated and decaffeinated coffee.
Coffee bean itself is loaded with many different nutrients and phytochemicals.
Reduced risk of death was not seen among the coffee drinkers in your study who were smokers or former smokers.
The study was published in the Circulation journal.