The heart has no limit on BPL (beats per lifetime). Too much caffeine *might* affect life expectancy, but that's for those who drink 8+ cups a day. Stress is a bigger factor in heart attacks, and people who drink that much coffee are usually under lots of stress. It's not necessarily the caffeine causing the problems. That said, though, I'd try to keep coffee/tea/cola consumption to under 4 cups a day.
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