I've had this happen before. They are the regular milk-chocolate M&M's. For the longest time, I couldn't identify what the smelled like, but I've now identified as Pepto-Bismal. It's just a bag every once in a while. They taste ok, but it sure takes the enjoyment out of eating them. I wonder what's causing them to smell like that. I opened the bag and there was the smell so it's not like someone here spilled Pepto-Bismal on them..