You only need to watch the first few minutes to understand that getting a booster is a death wish, especially if you exercise. If you watch the whole video, you'll see the well-mannered Dr Campbell having the closest he's ever come to having a hissy-fit!
He mentions New Zealand a few times — sadly!
One more thing: there's no such thing as "mild" heart damage — all heart damage is serious. Any damage to the heart will take years off your life. We're genetically programmed to live to about 110, then die peacefully in one's sleep when the heart finally decides it's time for us to go and stops beating. Any damage to the heart knocks off some, if not many, of those programmed years.
So, love and care for your heart!