Here's a few...
Heroin – smack, skag, junk
Cocaine – Coke, Dust, Gold Dust, Blow, Heaven Dust
Crack Cocaine – Black rock, Crank, Rock
Marijuana – Mary Jane, Wacky Tobaccky, Weed, Whackatabacky, 420, Buds, Grass
Methamphetamine – Crystal, Crystal Meth, Glass, Ice, Meth,
PCP – Angel’s Dust, Ozone, Rocket Fuel