according to public health authorities most of the cases of hiv infection were due to abuse of oxymorphone tablets which were dissolved and then injected authorities in the united states have indicated that the medical consequences of cannabis abuse continue to grow the percentage of emergency room visits and admissions to treatment reported as cannabisrelated increased from per cent in to per cent of all drugrelated admissions in at the same time surveys conducted in the north american region indicate that among young people there is a low perception of risk associated with regular cannabis use in the united states the monitoring the future survey showed that per cent of twelfth grade students aged years do not consider regular cannabis use to be harmful