My Husband Has 25 Percent Heart He Had Triple Bypass

My husband has 25 percent heart he had triple bypass now has defibalator pacemaker its been a year now he seems to be doing fine but he moves fast I am afaird he moving to fast for his heart to keep up he's back smoking whats your opion on how long can you live with that machine in him and can he move too fast and have another heartattic thank you