Yes... it looks much like copper... anyway, i think there is no problem is smoking weed with it. The temperature reached inside a pipe is not enough for vaporizing (or even melting) copper, so there is not any possibility of "poisoning" by it.

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"Everything we do, everything we are, rests on our personal power. If we have enough of it, one word uttered to us might be sufficient to change the course of our lives. But if we don't have enough personal power, the most magnificent piece of wisdom can be revealed to us and that revelation won't make a damn bit of difference." Don Juan Matus - Tales of Power