Wow.. unusual case but perhaps black licorice needs to come with warning labels!
Edit I got curious and looked it up. It is indeed not really licorice: http://archive.boston.com/business/articles/2011/08/29/whats...
The strongest liquorice in Germany has to be labelled (translated word-by-word) as "Strong liquorice, extra strong, liquorice for adults - not children's liquorice" [0]
[0] https://de.wikipedia.org/wiki/Lakritz#Zusammensetzung_von_La...