From a report on old consumer products containing now-illegal psychoactive substances from the Addiction Research Centre at the University of Buffalo.
Students at the University of Heidelburg take a break from their studies while smoking opium (c. 1900). I suppose it makes the accordion music even more enjoyable.
raincoaster 
While the guy in the chair happily sings:
“Mama’s got a squeeze box she wears on her chest
And the music’s so loud dad gets no rest
And she’s playin all night
And the music’s all right . . . .”
I think you have never been to Heidelburg. Although perhaps it would do the place some good if you would drop by.