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Jet is a powerful metamphetaminethat 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 & strength. ”— In-game description, Fallout 2
Jet is a highly addictive, hallucinogenic, meta-amphetamine first synthesized by Myron. It is extracted from brahmin dung fumes, manifests as an orange-red colored mist, and is administered via an inhaler.
When Myron first encountered the Mordinos, they were farming peyote cacti and selling it to tourists as the "Reno Experience." Unfortunately, as Myron explains, peyote trips last too long, and profit is generated by fast turnaround and a high addiction rate. Furthermore, the climate was far too ravaged and irradiated to grow anything but the hardiest of plants. So, Myron began delving into growing shrooms, since hallucinogens have low overhead and thrive in plentiful brahmin dung. From there, Myron began experimenting with derivatives of lysergic acid diethylamide, psilocybin and THC. However, the Mordinos still desired something harder and more addictive that would also fill the user with energy so they could gain control of Redding and their miners. The solution to the problem came from the brahmin dung fertilizer itself.
In the pre-War days, big, meat companies had experimented with a cheap protein extract for growing food. However, the extract came with a few problems. Any bacterial contamination (even from common skin bacteria) resulted in a complex mutational reaction, ruining any meat made from the process and turning it all into an amphetamine, so, entire meat-crop yields had to be abandoned. To cut their losses, the meat companies fed the extract to their cattle.
Using left over extract before the war to feed their brahmin in the shroom caves, Myron soon discovered that the fumes generated from dung of brahmin fed the contaminated protein extract was enough to achieve the effect the Modrinos wanted. By placing the contaminated brahmin dung in large vats, Myron and the Mordinos were finally able to begin producing the potent drug they had been after. About a hundred slaves were killed in initial testing of jet —mostly results of heart attacks, cerebral hemorrhages, and psychotic episodes— but jet was ultimately finalized for public consumption.
Thanks to Myron and jet, the Mordino family were able to build their chem empire. Grateful, they supplied their boy-genius with anything he wanted, usually whores and drugs. The Stables research team would further Myron's work, hoping to create a stronger and even more potent version, codenamed jet beta. However, the results were unsuccessful, as they couldn't quite get the kinks out (e.g., nasal bleeding, extreme hallucinations, heart attacks), though they did achieve in increasing the duration of its high - from 15 to 60 minutes.
Myron would die less than a year after the Chosen One defeated the Enclave, somewhat ironically stabbed to death by a jet addict in a bar at the Den. While no one remembered that Myron created jet or even remembers his name, his creation would live on, even spreading to the Capital Wasteland, where Murphy would produce an even more potent version, named 'ultrajet', designed for use by ghouls.
Meanwhile, in the Mojave Wasteland, some of the more scientifically enlightened learned about the secrets of the ultrajet and sought to make it themselves and home chemists developed a potent form of jet called rocket. This form of jet, however, is not produced on any sort of mass scale, due in part to the formula eluding the grasp of Great Khan chemists.
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.
While most characters say it has a near-100% addiction rate, for the player the rate is only 50% in Fallout 2, and only 20% in Fallout 3 and Fallout: New Vegas.
In Fallout 3, jet can be found in containers located in a sealed Vault, which appears to be an unintentional product of randomized loot tables. However, non leveled jet is placed in other locations that were seemingly untouched since the war, which is likely a mistake on the part of level designers, as jet was made years after the Great War.
This is the most common and basic form of jet, which all other variations are based off of.
This more powerful variant of jet was first seen in the Capital Wasteland, created by a ghoul named Murphy. He created ultrajet by combining jet, Sugar Bombs, and Abraxo cleaner. Later, in the Mojave Wasteland, ultrajet is found being sold by NCR Sergeant Daniel Contreras, the only known source in the area. How he obtained it remains a mystery.
Ultrajet is harder to get addicted to than standard jet, but the addiction to it is permanent, should someone abuse it too much.
This variant of jet is currently only known to be present in the Mojave Wasteland. Turbo is just an inhaler of jet jury rigged in an aerosol hairspray can filled with ground up broc flower, Cazador poison, and turpentine. The effect of turbo is unique to any other drug. Once taken, turbo gives the user a heightened sense of awareness with a brief slowdown of the surroundings for the user while not dampening the user actions.
This variant of jet is currently only known to be present in the Mojave Wasteland. Made by mixing jet with Nuka-Cola and detergent, the product provides a greater energy rush due to the refinement. The creation of rocket is presumably similar to the process of creating ultrajet, since they both require a cleaner agent and some form of sugar to make.