In the Original Investigation titled “Proactive Tobacco Cessation Outreach to Smokers of Low Socioeconomic Status: A Randomized Clinical Trial” published in the February 2, 2015, issue of JAMA Internal Medicine (2015;175[2]:218-226. doi:10.1001/jamainternmed.2014.6674), several errors appeared in the statement reporting results of the intervention’s cost-per-smoker analysis in the Discussion section. The correct statement is as follows: “For the 8544 registry-identified smokers in our clinics, the design and implementation of this intervention was estimated to cost $283 023 ($33.13 per registry-identified smoker).” This article has been corrected online.