Distinctively different from previous versions of Fallout, Jet now slows down time instead of granting the user more AP. For users who still want the previous benefits the Chem, there is an alternative: Jet Fuel, which still functions like 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 or if you have the caps; regularly seeing a doctor.
The recipe for jet alludes to the drug being produced with brahmin fertilizer - jet fumes were discovered using brahmin that had been fed a contaminated protein extract. For simplicity in-game, all fertilizer is identical, and can be used to synthesize 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 which is odd, seeing as jet was created after the war.