I found some milk chocolate M&Ms today that had been sitting in an old backpack of mine for about a year and a half. They were in one of those large bags and it was still mostly full, though they were already opened. Are they still safe to eat? I don't want to get ill, but I'm also pretty thrifty and I would feel bad throwing them away. I don't see any mold or anything on them, just signs they've been exposed to fluctuating temperatures (household temperatures). My mom's been eating them and she seems fine.

What does everyone think?