Villejuif Leaflet

Origin
The Villejuif leaflet was a pamphlet published in France that spread to the rest of Europe, Africa and the Middle East. It stated that many E number food additives were actually carcinogenic, being able to cause cancer; one of the most widely used was E330, citric acid. The original publisher has never been identified and caused a mass panic, copies being made to give to friends, fueling the fire even more. It was passed onto organizations including schools, hospitals and pharmacies without anyone researching if such claims of cancerous food additives were true.

Effects
The pamphlet will turn additives on the list carcinogenic if a person reads it, increasing their chances of getting cancer. There are multiple pamphlets in existence with the same ability and are all kept in separate containers made of a blurry looking material to stop wandering glances from catching words and cancer.