The origins of cannabis smoking: Chemical residue evidence from the first millennium BCE in the Pamirs Ren, Meng ; Tang, Zihua ; Wu, Xinhua ; Spengler, Robert ; Jiang, Hongen ; Yang, Yimin ; Boivin, Nicole Abstract Publication: Science Advances Pub Date: June 2019 DOI: 10.1126/sciadv.aaw1391 Bibcode: 2019SciA....5.1391R