We know how to party here at Roadrunner, but that doesn't mean we're a bunch of dirty hippies. So rather than "celebrate" the unofficial stoner holiday known as 4/20 with a Friday Spotify playlist made up of songs about weed (or conducive to weed smoking), we've assembled something a little...darker. Here are 10 songs dealing with the horrors of drug addiction, including tracks by DevilDriver, Dream Theater, Korn, Life of Agony, Machine Head, Megadeth, Nickelback, Slipknot, Trivium and Type O Negative.