Some 1,400 years ago, people living in what is now Washington state were smoking smooth sumac, Rhus glabra. Scientists found residues of the native plant in an ancient pipe.

“Smoking often played a religious or ceremonial role for Native American tribes and our research shows these specific plants were important to these communities in the past,” lead study author Korey Brownstein, a former doctoral student at Washington State University, now at the University of Chicago, said in a news release. “We think the Rhus glabra may have been mixed with tobacco for its medicinal qualities and to improve the flavor of smoke.”

“Not only does it tell you, yes, you found the plant you’re interested in, but it also can tell you what else was being smoked,” said study co-author David Gang, a professor in Washington State’s Institute of Biological Chemistry. “It wouldn’t be hyperbole to say that this technology represents a new frontier in archaeo-chemistry.”

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