In the Original Investigation titled “Association Between Initial Use of e-Cigarettes and Subsequent Cigarette Smoking Among Adolescents and Young Adults: A Systematic Review and Meta-analysis,”1 published online June 26, 2017, and in the August 2017 print edition, there was an error in the first sentence of the Results section. The number given as “16 621 adolescents and young adults” should have been 17 389. This article was previously corrected.2,3 This article has been corrected online.