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. 2021 Jan 4;23(1):e21212. doi: 10.2196/21212

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©Duilio Balsamo, Paolo Bajardi, Alberto Salomone, Rossano Schifanella. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 04.01.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in the Journal of Medical Internet Research, is properly cited. The complete bibliographic information, a link to the original publication on http://www.jmir.org/, as well as this copyright and license information must be included.

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Popularity of opioid substances among opioid firsthand users on Reddit. Each line represents the share of opioid firsthand users mentioning an opioid substance, measured quarterly from 2014 to 2018.