Painkillers; vicodin, oxycodone, etc.
Smug hipsters like to think they're doing heroin by living vicariously through their favorite androgynous hipster musicians who have lyrics about heroin. Oddly enough, they would never touch heroin because of the stigma, even though painkillers and heroin are both opiates and chemically very similar.
Dude: "So you're doing hipster heroin every day and you talk down on people who do heroin? You'd probably save some money if you stop lying to yourself and switch to dope. Don't you wanna be like the Velvet Underground?"
Hipster: "No way dude, I'm never gonna touch that stuff. Heroin isn't even like a painkiller hurr durr. And I'm not a hipster (lie)."