In this issue of JAMA Pediatrics, Pierce et al1 show that adolescents and young adults (AYAs) who report a favorite tobacco product advertisement, recall having seen a tobacco advertisement, or report liking a tobacco advertisement were more likely to initiate use of tobacco products 1 year later. This prospective association was observed across various products, including (for the first time to our knowledge in a national sample) electronic cigarettes (e-cigarettes) and other noncigarette tobacco products.