Jet addiction is a form of addiction which can occur in Fallout 2, Fallout 3 and Fallout: New Vegas.
“You used the drug Jet once too often and now your body is craving for more... and more... and more... well done! You got yourself addicted.”
Fallout 2
“Everything is moving so slowly... you need to get some more Jet, right NOW!”— Fallout 2 In-game description
Using Jet carries a 50% chance to become addicted. When addicted to Jet, you suffer from a -1 penalty to Strength and Perception.
Fallout 3, Fallout: New Vegas
Using Jet carries a 20% chance to become addicted. When addicted to Jet, you suffer from a -1 penalty to Agility and Charisma.