Usage History of 'opioids'

The following chart shows how frequently 'opioids' appeared in printed materials over time. For example, the word 'opioids' occurred 2 times in books in 1834 and 36,205 times in 2008. From 1834 to 2008, the word 'opioids' was used a total of 612,738 times in books scanned by Google. See Reference: Google Ngram project.

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