Jet

Jet is a highly addictive form of metamphetamine that appears in Fallout 2, Fallout 3, Fallout: New Vegas, and Fallout 4.

Post-War
The same situation occurred in Appalachia, where gangs like the Blood Eagles used drugs such as Jet to addict recruits, forcing them to continue service to their gang.

Behind the scenes

 * Jet as an inhaled drug was Chris Avellone's idea, inspired by his brother's asthma inhaler.
 * Jet is mentioned in the Fallout Bible.
 * When asked why Jet cannot be found in pre-War pharmacies, Joshua Sawyer stated that it was invented after the war.