On Breaking Bad, what do they use to simulate the meth while it’s being smoked?

Question by Karen◦the◦Rockstar: On Breaking Bad, what do they use to simulate the meth while it’s being smoked?
.. it looks pretty fake =) .. the pipe is always all brown and dirty, which if the stuff Walt is cooking is as pure as its made out to be, wouldn’t happen! and in the scenes where Jessie is smoking, he barely even blows out any smoke. I mean, obviously they didn’t give him REAL meth to smoke, but what the heck is actually in that pipe? Sugar? because that’s how it burns.

Best answer:

Answer by Rob R
The actors are actually smoking rock sugar, similar to rock candy. They just don’t inhale.

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