Heh heh... Everything could be...
What is historically proven is that in my area cannabis was grown on a large scale during the time of the Umayyad Emirate of Cordoba, and that at least since the subsequent Caliphate, this cannabis was smoked (in beautiful pipes that I can show you if you are interested; in the shape of a boat, a lion, etc...); and it is also true that "your ancestors" Vikings "visited" mine both in the Emiral and Caliphal times...
...Who knows... Perhaps one of my ancestors was the first to teach yours to smoke good grass from the Guadalquivir Valley, he...
Pd:
Photos of anothers beautiful pipes, somewhat later than the previous one I showed you; these others belongs to the time and area of the Hispano-Muslim Nazarite Sultanate of Granada (1238 - 1492); (Exhibited to the public in the "cannabis pipes" section of Room 7 of the Alhambra Museum (Granada, Spain)):
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last one looks like a poppy flower from above...so would think this was used to smoke opium