Assertion: narcotic's use | /r/HasSubevent | change
Facets:
value: within the body
type: LOCATION
value: in the central nervous system
type: OTHER
Source sentences:
text: Chronic use of certain substances leads to a change in the central nervous system known as a 'tolerance' to the medicine such that more of the substance is needed in order to produce desired effects.
text: Sustained use of painkillers or other dangerous narcotics such as heroin will lead to changes within the body that result in a perceived need to use the drugs just to feel “good”.