if someone discovered a new, delicious fruit that science said was cumulative poison and would 'eventually' kill you, some folks would nibble at it, promising themselves they would stop if they felt like they were dying.

I guess we could explain 'short attention span' and 'deferred gratification' and 'taking the long view' and 'cost-benefit analysis' until we were blue in the face, and it wouldn't make a dent in the behavior of those who have short attention span and can't 'defer gratification'...etc.

ummm...'scuse me, I need my coffee and something with LOTS of sugar before I can type more...