Jet

Jet is a powerful metamphetamine that stimulates the central nervous system. The initial euphoric rush rarely lasts more than a few minutes, but during that time, the user is filled with a rush of energy and strength. The drug was synthesized by Myron, and is made from Brahmin dung. Thanks to Myron and the Jet, the Mordino family built their drug empire.

Inconsistencies
While it is said that Myron created Jet, Mrs. Bishop says that she got hooked on Jet by Bishop (before they got married) and for that she got kicked out of Vault City, which would require Jet to be much older than Myron is. According to Chris Avellone, what Mrs. Bishop says is a mistake and is not canon. It is more likely that Bishop got her hooked on some other drug. Consistent use of Jet will have muddled Mrs. Bishop's perceptions in any case.