I always find these types of reasons quite strange... I mean understandable and everything, sure. But to me, it'd be like the equivalent of saying "my family has people with heart problems in it that all stemmed from eating too much and doing no exercise, therefore I, who doesn't eat too much and do exercise, will not allow myself this delicious meat pie!"
Nah, I just figure, I'm not them... so... why bind myself to their behaviour patterns? I'm not trying to undermine your decision, just saying... y'know...