Marijuana is not legal in the Netherlands, but smokers can't be prosecuted for possessing small amounts and it is sold openly in cafes known euphemistically as "coffee shops."
Cyrus, who long ago shed her image of innocence as the child star of "Hannah Montana," has made no secret of her appreciation of Amsterdam's attractions, arriving the Friday before the show and hanging out at the Greenhouse coffee shop downtown with several other stars.
She also wore marijuana leaf emblems in her earphones during a live rendition of "Wrecking Ball" against the backdrop of a giant video screen of herself crying.
The EMAs traditionally focus on global, rather than U.S. pop music acts, though there's a lot of overlap: winners included Bruno Mars, who grabbed Best Song for "Locked Out of Heaven," and Eminem both in the Best Hip Hop and Global Icon category.
The "intergalactic"-themed show is scheduled to be rebroadcast in the U.S. later Sunday.
Another notable winner was Katy Perry for Best Female Artist. Perry, apparently caught by surprise at her win, spit out a sip of champagne and took the stage to thank her fans.
During Perry's performance earlier, she hung suspended by wires as green lasers reflected off her mirrored outfit during a rendition of "Unconditional."
Eminem, who has just released his first album in several years, appeared to have lost none of his rapping skill as he performed "Rap God," spitting out words at a blistering pace.
He was handed his Global Icon honor by "Anchorman" character "Ron Burgundy" (actor Will Ferrell), who informed him that Dutch DJ Afrojack had been insulting him behind his back.
"Who?" Eminem deadpanned.