Sleep
A fantastic drug that every person in the world is addicted to. This is something with which we are born with a hereditary built up tolerance to, deeming it absolutely impossible to ever have enough to truly satisfy our craving for it.
David: Hey man, you look like shit Enrique: I know, I barely got any sleep yesterday David: How much did you get Enrique: 8 hours, but it never seems like enough
By superfragilisticexpialidocious