In the GEE logistic regression models, survey cycle was included as a categorical time variable (e.g., 2, 3, 4, and 5), and models were additionally adjusted for socio-demographic characteristics, including age group, sex, race/ethnicity, and household income
The persistence can be attributed to several factors: strong nicotine addiction, targeted marketing (especially in low- and middle-income countries), limited access to cessation resources, and cultural normalization in specific communities
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Prof Peter Hajek, director of the Health and Lifestyle Research Unit at Queen Mary University of London, said false beliefs about vapes discouraged smokers from making the switch and closed the door to a relatively easy way out of the deadly habit