A lot of 'Sudden Death' runs in families and is indeed genetic. So the wisest thing a player can do is look around his family for such.
Having said that, abandoning the game 'just in case' just doesn't seem realistic.
The heart is electrically driven and relies on various salts and minerals to be in the body.
Should you have a bad bout of diareah say or just chuck up too much after a heavy night out, you might well be delpleted and suffer the consequence of battery failure.
Rather than worry about steroids and such, it's better to get people to not play when their body is on survival rations .. speaking of which ..there is no harm in taking some rehydration salts, bought over the counter, to keep the grim reaper at bay.
A bit folksy perhaps but true none the less.