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. 2021 Feb 15;23(2):e25578. doi: 10.2196/25578

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©Jennifer D Marler, Craig A Fujii, Joseph A Galanko, Daniel J Balbierz, David S Utley. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 15.02.2021.

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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Study participant flow: Consolidated Standards of Reporting Trials (CONSORT) diagram. ITT: intention to treat; CPD: cigarettes per day.