source: Other drugs are adulterated with substances to create addiction, an example being the adulteration of cannabis in B.C. Canada with methamphetamine.
target: Other drugs are adulterated with substances.  These substances create addiction.  An example being the adulteration of cannabis in B.C. Canada.  It is adulterated with methamphetamine.
references: Other drugs are adulterated with substances.  These substances create addiction.  An example being the adulteration of cannabis in B.C. Canada.  It is adulterated with methamphetamine.