vc commodore
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Also torqueing the plug plays a major role, over doing them up can stress the thread and cause damage to the cylinder head or the plug, under tighten them wont dissipate the heat correctly which leads to detonation or pinging then engine damage.
If the engine isn't tuned properly or your using poor fuel this can lead to plug failure, bad leads even coil pack not giving the spark they need can damage plugs and your catalytic convertor. Food for thought.
Torquing up spark plugs.....That's a new one....Must do that next time I change plugs in any of my cars.
Oh and yeah...You can over tighten them and cause issues....Under tightening them, generally means you have the sound of escaping air through the plug hole....And you can also spit a plug out as a result