Additionally, another study of more than 3,500 high school students in Southern California found that flavored oral nicotine products (i.e., gum, lozenges, and gummies), which are often marketed as tobacco-free or tobacco leaf-free, were the second most popular nicotine products used among adolescents, after e-cigarettes
Fourth, smoking behaviours were self-reported and may have recall and misclassification bias, and there may be differences in the distribution of individuals excluded due to lacking smoking information
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"When Wal-Mart Enters: How Incumbent Retailers React and how this Affects their Sales Outcomes"
Before writing the details, let me tell that all smoker have different reasons for switching to other brands, or products