This recent crisis regarding adulterants/diluents for oil pens reminds me of nothing so much as "jake leg", but in that case the adulterating agent was used to

This recent crisis regarding adulterants/diluents for oil pens reminds me of nothing so much as "jake leg", but in that case the adulterating agent was used to mislead the authorities as to the composition of the product, not the users: https://en.wikipedia.org/wiki/Jamaica_ginger https://en.wikipedia.org/wiki/Jamaica_ginger