For an overview of jet in the various Fallout games, see Jet.
“Using Jet creates an altered state of consciousness where time appears to slow, allowing you to perform more actions than normal for a limited period of time.”— Loading screen
Distinctively different from previous versions of Fallout, jet slows down time instead of granting the user more AP.
For users who still want the previous benefits, there is an alternative: Jet Fuel, which still functions as the previous versions. Some distinctive features of this version of jet are the effects are more akin to that of turbo, a chem commonly associated with the Mojave.
The use of jet boosts the user's reaction speed by seemingly slowing down time around them with minimal effect on their own movement. Additionally, it significantly increases jump distance and maximum firing rate for a total of ten seconds, whereas the effects of turbo only last for three. The effects, however, become shorter each time it is taken within five minutes of each other. The negative impact of impatience can be remedied by either waiting to use again, taking addictol or if one has the caps; regularly seeing a doctor.
Jet can be sold to Bobby De Luca in Vault 81 for 75 caps each, making this an incredible, if time-consuming, money maker; dialogue must be initiated for each transaction. Even with all the required merchant perks, it can only be sold normally for 40 caps (50 base price with 80% limit applied to sale value) to regular vendors.
When used, colors become more saturated and lights become slightly brighter. This visual effect, combined with the inhaler intake and slow-motion perception, makes the Fallout 4 depiction of jet similar to the drug Slo-Mo from the 2012 film, Dredd.
Jet can be found in locations from before the Great War, even though it was created after the war. In the Vault-Tec Regional HQ, information found in a terminal entry made by Dr. Reid details that a shipment was made to Vault 95, containing 15 boxes of jet and Psycho. Its presence in Vault 95 remains inconsistent with Fallout canon.
The item model for Jet was reused for the Addictol chem.
The recipe for jet alludes to the drug being produced with brahmin fertilizer [citation needed]. In Fallout 2, Myron confirmed that jet fumes were discovered using brahmin that had been fed a contaminated protein extract. In Fallout 4 all fertilizer is identical and can be used to synthesize jet, for simplicity.
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