saccharin

Sweet N' Low, sugar, and salt and pepper shakers
William Hartz / Flickr

I always thought twice before adding those little pink packets to my iced tea because a little voice in my head was telling me they were bad. No proof, just something I had heard somewhere.

As it turns out, saccharin WAS on EPA's hazardous constituent list. It's been on the list since 1980. The substance was put on the list because the EPA's Carcinogen Assessment Group listed it as a "potential human carcinogen."