Sure, people might use drugs when listening to dance music, but hip-hop lately has been a 24/7 advertisement for Molly, which finally took over in 2012 after nearly a decade of Lean commercials.
Substance addiction is one of the most serious problems in the industry. Few stars haven't been touched by it, and Eminem (who once released a four-minute ad for "Purple Pills") has gone on the record to speak out against it, as has T.I.
If a rapper released a song tomorrow that argued for a return to huffing paint fumes, you'd walk down the street and see 30 kids with their snapback-clad heads inside paper bags the very next day. Never has the link between capitalism and drug addiction been made so apparent.