Yes, particularly if you're over 40 and have a history of heart disease or high blood pressure, or both.

Eating more than 57g (2 ounces) of black liquorice a day for at least 2 weeks could lead to potentially serious health problems, such as an increase in blood pressure and an irregular heart rhythm (arrhythmia).

For most people, liquorice found in foods is safe to eat and safe when consumed in large amounts in medicines for short periods of time.