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Movie sets are drug-free environments, at least in theory. Even if an actor is playing a tie-dye-wearing burnout whose best friend is a honey-bear bong, puffing the real thing is strictly verboten. (We'll refrain from speculating about what happens in the trailer.)

So what do actors actually toke—or snort or shoot or huff—on camera? That depends upon their characters' drug of choice.

Methamphetamine

The speed cooked up by Walter White (Bryan Cranston) on Breaking Bad won't give you meth mouth, but it might cause cavities—rock candy is the stand-in for Heisenberg's product.

Marijuana

Throughout Pineapple Express, characters smoke a nontobacco herb from online head shop International Oddities. It looks like pot, it blazes like pot, but no word on if it "smells like God's vagina."

Cocaine

Legend has it that Al Pacino plowed through real coke on the set of Scarface. When it was time for the cast of 2001's Blow to go skiing, though, the actors snorted inositol—powdered vitamin B.

Crack

Ryan Gosling's rock in the indie film Half Nelson was actually a piece of a broken drinking mug that prop artists had dyed with coffee. A bit of tobacco provided the smoke, and voilà: Pookie status.