e-cigarette. The goal of tobacco companies also drives the widespread use of flavored tobacco products. According to a 2008 study, the internal tobacco company documents found that makers of the largest menthol cigarette brands in the United States—Kool, Newport, Salem, Marlboro, and Camel—formulated the menthol levels in their cigarettes, as well as their marketing strategies, to entice young people. Likewise, multiple reviews of internal tobacco company documents have found that flavored cigarettes are deliberately introduced to appeal to young people, with flavorings often being fine-tuned to best appeal to youth. Furthermore, flavored tobacco products are often advertised to children and adolescents. Flavored cigarettes have been advertised in magazines frequently read by kids, such as Sports Illustrated, Cosmopolitan, and Rolling Stone and on television programs watched by adolescents. A majority of adolescents and young adults are exposed to cigarillo advertising in magazines and storefronts and on social media. Flavored e-cigarettes have been marketed extensively to youth in retail stores and on television and social media: 78.2 percent of American youth (20.5 million people). A 2018 analysis of the 2014, 2015, and 2016 NYTS data by the CDC found that retail stores were where most youth were exposed to e-cigarette advertisements, followed by online advertising, television advertising, and then newspaper and magazine advertising. About 24 million youth have been exposed to e-cigarette ads on cable TV, primarily due to an ad campaign for blu e-cigarettes. On social media, marketing includes images associated with youth culture, endorsements by celebrities and social media influencers popular with youth, and themes that have been found to strongly appeal to youth (such as freedom and rebellion). Ads for flavored e-cigarettes have been shown to cause children to be more interested in buying and trying e-cigarettes, as compared to ads for unflavored e-cigarettes. Regulation Although a few countries have banned flavored cigarettes (except menthol), flavors in most tobacco products remain unregulated across the globe. The Family Smoking Prevention and Tobacco Control Act, passed by the United States Congress in October 2009, bans cigarettes with flavors other than menthol or tobacco. However, some tobacco companies have rebranded their flavored cigarettes as “little” or “filtered” cigars in order to circumvent this ban. In December 2016, the U.S. Food and Drug Administration (FDA) sent warning letters to four tobacco companies—Swisher International, Inc., Cheyenne International LLC, Prime Time International Co. and Southern Cross Tobacco Company Inc.—for marketing their fruit-flavored cigarettes as cigars