Nutella does not contain Nicotine- and does not need it for you to be "addicted." Drugs like crack and cocaine do not have Nicotine in them but people are still addicted to them.
The creators of Nutella put in special ingredients that trigger sensors in your brain to want more- this causes you to eat more, buy more, and in turn, they make more money. The same is done in snack cakes, chips, and sodas.