INT - MONARCH MOTEL(Gotham City) - DAY 

3  young men lace marijuana with short term stimulants 

Alkyl nitrites were first produced in 1844 to provide relief from chest pain (angina) caused by poor blood flow to the heart, by relaxing narrowed blood vessels throughout the body.

Once safer, more effective alternatives such as nitro-glycerine were developed during the 1960s, medical use of alkyl nitrites decreased— although they continue to be used to treat cyanide poisoning in some countries. 

There were also reports of poppers being provided to soldiers in the Vietnam War to help counteract the negative effects of inhaling gun fumes, and short-term inhalants continue to be used in combat situations worldwide.