We got a TON of candy this year, and then my mom also had a TON left over from work... so we packed huge bags up and took one to the Firehouse and the other to an assisted living home. Both places were very thankful to get the candy!
I do think smarties go bad, they start to turn different colors and get dark dots on them and they don't taste so good after that.
As for the dum-dums they to get old, when they get old the candy gets kind of gross.