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(A) User perception of health risks associated with novel psychoactive substance (NPS) use and (B) 2017 user risk awareness by age. Data expressed as absolute number of responses (on histobar) and % of user respondents. There is a decreased trend (P > .05) in health risk perception in 2017 survey sample compared with 2015 sample. There is no age group effect on risk awareness of the 2017 NPS users (P > .05)
