What is "Polysubstance?"

Patricia K asks:

I am not familiar with the term poly substance use.  After reading the case history I am guessing that it has to do with the use of multiple drugs but I would like some clarification.

Thanks!

Heather responds:

Hi Patricia! You are right on point. Polysubstance means that the child is using no less than three substances (caffeine and nicotine excluded), for example, marijuana, alcohol and opiates .

Do you have any thoughts to add?