Can I just gently point out that this is talking about black liquorice root - as in the medicinal spice - not the rather yummy confectionary of the same name which is made from treacle and actually has very little liquorice in it at all...
Various helath food shops sell the root as sticks that you can chew on, but its not like the confectionary version, and I would also echo Susans Wise warning. Hypokalemia can cause life threatening cardiac arrythmias. You really don't want to go there. I've dealt with people with hypokalemia in ER and its not a fun thing, so please be careful.